81696264 has 32 divisors (see below), whose sum is σ = 219952320. Its totient is φ = 25137216.

The previous prime is 81696247. The next prime is 81696269. The reversal of 81696264 is 46269618.

It is not an unprimeable number, because it can be changed into a prime (81696269) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130612 + ... + 131235.

It is an arithmetic number, because the mean of its divisors is an integer number (6873510).

Almost surely, 2^81696264 is an apocalyptic number.

It is an amenable number.

81696264 is an abundant number, since it is smaller than the sum of its proper divisors (138256056).

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

81696264 is a wasteful number, since it uses less digits than its factorization.

81696264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261869 (or 261865 counting only the distinct ones).

The product of its digits is 124416, while the sum is 42.

The square root of 81696264 is about 9038.5985639368. The cubic root of 81696264 is about 433.9110721263.

The spelling of 81696264 in words is "eighty-one million, six hundred ninety-six thousand, two hundred sixty-four".