81164758 has 32 divisors (see below), whose sum is σ = 129576960. Its totient is φ = 38076480.

The previous prime is 81164747. The next prime is 81164767. The reversal of 81164758 is 85746118.

It is a self number, because there is not a number n which added to its sum of digits gives 81164758.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 357441 + ... + 357667.

It is an arithmetic number, because the mean of its divisors is an integer number (4049280).

Almost surely, 2^81164758 is an apocalyptic number.

81164758 is a deficient number, since it is larger than the sum of its proper divisors (48412202).

81164758 is a wasteful number, since it uses less digits than its factorization.

81164758 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412.

The product of its digits is 53760, while the sum is 40.

The square root of 81164758 is about 9009.1485724235. The cubic root of 81164758 is about 432.9680330981.

The spelling of 81164758 in words is "eighty-one million, one hundred sixty-four thousand, seven hundred fifty-eight".