81928264 has 16 divisors (see below), whose sum is σ = 167580720. Its totient is φ = 37240080.

The previous prime is 81928261. The next prime is 81928303. The reversal of 81928264 is 46282918.

It is not an unprimeable number, because it can be changed into a prime (81928261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 465414 + ... + 465589.

It is an arithmetic number, because the mean of its divisors is an integer number (10473795).

Almost surely, 2^81928264 is an apocalyptic number.

It is an amenable number.

81928264 is an abundant number, since it is smaller than the sum of its proper divisors (85652456).

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

81928264 is a wasteful number, since it uses less digits than its factorization.

81928264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 931020 (or 931016 counting only the distinct ones).

The product of its digits is 55296, while the sum is 40.

The square root of 81928264 is about 9051.4233134905. The cubic root of 81928264 is about 434.3214222964.

The spelling of 81928264 in words is "eighty-one million, nine hundred twenty-eight thousand, two hundred sixty-four".