| Base | Representation |
|---|---|
| bin | 10011010001000… |
| … | …10111010110000 |
| 3 | 102021010100002000 |
| 4 | 21220202322300 |
| 5 | 312333424403 |
| 6 | 24012054000 |
| 7 | 4001531130 |
| oct | 1150427260 |
| 9 | 367110060 |
| 10 | 161623728 |
| 11 | 83261332 |
| 12 | 46164300 |
| 13 | 2763b856 |
| 14 | 17672ac0 |
| 15 | e2c87a3 |
| hex | 9a22eb0 |
161623728 has 320 divisors, whose sum is σ = 583296000. Its totient is φ = 41803776.
The previous prime is 161623717. The next prime is 161623729. The reversal of 161623728 is 827326161.
161623728 is a `hidden beast` number, since 1 + 6 + 1 + 623 + 7 + 28 = 666.
It is a super-2 number, since 2×1616237282 = 52244458905235968, which contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (36).
It is a nude number because it is divisible by every one of its digits.
It is a junction number, because it is equal to n+sod(n) for n = 161623692 and 161623701.
It is not an unprimeable number, because it can be changed into a prime (161623729) by changing a digit.
It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1666176 + ... + 1666272.
It is an arithmetic number, because the mean of its divisors is an integer number (1822800).
Almost surely, 2161623728 is an apocalyptic number.
161623728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 161623728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (291648000).
161623728 is an abundant number, since it is smaller than the sum of its proper divisors (421672272).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
161623728 is a wasteful number, since it uses less digits than its factorization.
161623728 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 169 (or 157 counting only the distinct ones).
The product of its digits is 24192, while the sum is 36.
The square root of 161623728 is about 12713.1321081785. The cubic root of 161623728 is about 544.7137941188.
Adding to 161623728 its reverse (827326161), we get a palindrome (988949889).
The spelling of 161623728 in words is "one hundred sixty-one million, six hundred twenty-three thousand, seven hundred twenty-eight".
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