81235692 has 36 divisors (see below), whose sum is σ = 205654176. Its totient is φ = 27037920.

The previous prime is 81235681. The next prime is 81235709. The reversal of 81235692 is 29653218.

It is a tau number, because it is divible by the number of its divisors (36).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31558 + ... + 34034.

It is an arithmetic number, because the mean of its divisors is an integer number (5712616).

Almost surely, 2^81235692 is an apocalyptic number.

It is an amenable number.

81235692 is an abundant number, since it is smaller than the sum of its proper divisors (124418484).

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

81235692 is a wasteful number, since it uses less digits than its factorization.

81235692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3398 (or 3393 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 81235692 is about 9013.0844886753. The cubic root of 81235692 is about 433.0941272823.

The spelling of 81235692 in words is "eighty-one million, two hundred thirty-five thousand, six hundred ninety-two".