81310896 has 60 divisors (see below), whose sum is σ = 235416480. Its totient is φ = 26167680.

The previous prime is 81310891. The next prime is 81310897. The reversal of 81310896 is 69801318.

It is a super-2 number, since 2×81310896² = 13222923616645632, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 81310896.

It is not an unprimeable number, because it can be changed into a prime (81310891) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5560 + ... + 13911.

It is an arithmetic number, because the mean of its divisors is an integer number (3923608).

Almost surely, 2^81310896 is an apocalyptic number.

It is an amenable number.

81310896 is an abundant number, since it is smaller than the sum of its proper divisors (154105584).

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

81310896 is a wasteful number, since it uses less digits than its factorization.

81310896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19514 (or 19505 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 81310896 is about 9017.2554582866. The cubic root of 81310896 is about 433.2277317954.

The spelling of 81310896 in words is "eighty-one million, three hundred ten thousand, eight hundred ninety-six".