| Base | Representation |
|---|---|
| bin | 100100100000111… |
| … | …0011101100010100 |
| 3 | 10011101110011001000 |
| 4 | 1021001303230110 |
| 5 | 10002123220034 |
| 6 | 321324303300 |
| 7 | 42235055460 |
| oct | 11101635424 |
| 9 | 3141404030 |
| 10 | 1225210644 |
| 11 | 579665989 |
| 12 | 2a23a1b30 |
| 13 | 166ab0518 |
| 14 | b8a134a0 |
| 15 | 7286a599 |
| hex | 49073b14 |
1225210644 has 192 divisors, whose sum is σ = 3912007680. Its totient is φ = 323896320.
The previous prime is 1225210627. The next prime is 1225210673. The reversal of 1225210644 is 4460125221.
1225210644 is a `hidden beast` number, since 1 + 2 + 2 + 5 + 2 + 10 + 644 = 666.
It is a super-2 number, since 2×12252106442 = 3002282244341789472, which contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (27).
It is a congruent number.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 537892 + ... + 540164.
It is an arithmetic number, because the mean of its divisors is an integer number (20375040).
Almost surely, 21225210644 is an apocalyptic number.
1225210644 is a gapful number since it is divisible by the number (14) 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 1225210644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1956003840).
1225210644 is an abundant number, since it is smaller than the sum of its proper divisors (2686797036).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1225210644 is a wasteful number, since it uses less digits than its factorization.
1225210644 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 2347 (or 2339 counting only the distinct ones).
The product of its (nonzero) digits is 3840, while the sum is 27.
The square root of 1225210644 is about 35003.0090706499. The cubic root of 1225210644 is about 1070.0488066944.
Adding to 1225210644 its reverse (4460125221), we get a palindrome (5685335865).
The spelling of 1225210644 in words is "one billion, two hundred twenty-five million, two hundred ten thousand, six hundred forty-four".
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