81164510 has 64 divisors (see below), whose sum is σ = 174403584. Its totient is φ = 26611200.

The previous prime is 81164497. The next prime is 81164549. The reversal of 81164510 is 1546118.

It is a self number, because there is not a number n which added to its sum of digits gives 81164510.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 245045 + ... + 245375.

It is an arithmetic number, because the mean of its divisors is an integer number (2725056).

Almost surely, 2^81164510 is an apocalyptic number.

81164510 is an abundant number, since it is smaller than the sum of its proper divisors (93239074).

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

81164510 is a wasteful number, since it uses less digits than its factorization.

81164510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489.

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 81164510 is about 9009.1348086262. The cubic root of 81164510 is about 432.9675921178.

The spelling of 81164510 in words is "eighty-one million, one hundred sixty-four thousand, five hundred ten".