81013760 has 44 divisors (see below), whose sum is σ = 194350368. Its totient is φ = 32403456.

The previous prime is 81013741. The next prime is 81013781. The reversal of 81013760 is 6731018.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2792 + ... + 13031.

Almost surely, 2^81013760 is an apocalyptic number.

81013760 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81013760 is an abundant number, since it is smaller than the sum of its proper divisors (113336608).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81013760 is a wasteful number, since it uses less digits than its factorization.

81013760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15848 (or 15830 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 81013760 is about 9000.7644119819. The cubic root of 81013760 is about 432.6993701421.

Adding to 81013760 its reverse (6731018), we get a palindrome (87744778).

The spelling of 81013760 in words is "eighty-one million, thirteen thousand, seven hundred sixty".