81364832 has 24 divisors (see below), whose sum is σ = 165356352. Its totient is φ = 39369600.

The previous prime is 81364831. The next prime is 81364847. The reversal of 81364832 is 23846318.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 81364792 and 81364801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81364831) 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, 40019 + ... + 42002.

It is an arithmetic number, because the mean of its divisors is an integer number (6889848).

Almost surely, 2^81364832 is an apocalyptic number.

It is an amenable number.

81364832 is an abundant number, since it is smaller than the sum of its proper divisors (83991520).

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

81364832 is a wasteful number, since it uses less digits than its factorization.

81364832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82062 (or 82054 counting only the distinct ones).

The product of its digits is 27648, while the sum is 35.

The square root of 81364832 is about 9020.2456729293. The cubic root of 81364832 is about 433.3235016836.

The spelling of 81364832 in words is "eighty-one million, three hundred sixty-four thousand, eight hundred thirty-two".