Base | Representation |
---|---|
bin | 100101110111011110… |
… | …1000000110110010000 |
3 | 21202220012212212110200 |
4 | 1023232331000312100 |
5 | 2313020001223432 |
6 | 101205051055200 |
7 | 5606100564540 |
oct | 1135675006620 |
9 | 252805785420 |
10 | 81318382992 |
11 | 3153a11a800 |
12 | 13915441500 |
13 | 788c3081b2 |
14 | 3d15cc3320 |
15 | 21ae0e0a7c |
hex | 12eef40d90 |
81318382992 has 360 divisors, whose sum is σ = 288703938432. Its totient is φ = 20913361920.
The previous prime is 81318382991. The next prime is 81318382993. The reversal of 81318382992 is 29928381318.
81318382992 is a `hidden beast` number, since 8 + 1 + 318 + 38 + 299 + 2 = 666.
It is an interprime number because it is at equal distance from previous prime (81318382991) and next prime (81318382993).
It is a super-2 number, since 2×813183829922 (a number of 23 digits) contains 22 as substring.
It is a nude number because it is divisible by every one of its digits.
It is not an unprimeable number, because it can be changed into a prime (81318382991) by changing a digit.
It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 12559468 + ... + 12565940.
Almost surely, 281318382992 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 81318382992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144351969216).
81318382992 is an abundant number, since it is smaller than the sum of its proper divisors (207385555440).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
81318382992 is a wasteful number, since it uses less digits than its factorization.
81318382992 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 6619 (or 6599 counting only the distinct ones).
The product of its digits is 1492992, while the sum is 54.
The spelling of 81318382992 in words is "eighty-one billion, three hundred eighteen million, three hundred eighty-two thousand, nine hundred ninety-two".
• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.070 sec. • engine limits •