81137832 has 16 divisors (see below), whose sum is σ = 202844640. Its totient is φ = 27045936.

The previous prime is 81137831. The next prime is 81137857. The reversal of 81137832 is 23873118.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 81137793 and 81137802.

It is not an unprimeable number, because it can be changed into a prime (81137831) 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, 1690348 + ... + 1690395.

It is an arithmetic number, because the mean of its divisors is an integer number (12677790).

Almost surely, 2^81137832 is an apocalyptic number.

It is an amenable number.

81137832 is an abundant number, since it is smaller than the sum of its proper divisors (121706808).

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

81137832 is a wasteful number, since it uses less digits than its factorization.

81137832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3380752 (or 3380748 counting only the distinct ones).

The product of its digits is 8064, while the sum is 33.

The square root of 81137832 is about 9007.6540786156. The cubic root of 81137832 is about 432.9201494807.

The spelling of 81137832 in words is "eighty-one million, one hundred thirty-seven thousand, eight hundred thirty-two".