81832920 has 64 divisors (see below), whose sum is σ = 264388320. Its totient is φ = 20143104.

The previous prime is 81832897. The next prime is 81832931. The reversal of 81832920 is 2923818.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24669 + ... + 27788.

Almost surely, 2^81832920 is an apocalyptic number.

It is an amenable number.

81832920 is an abundant number, since it is smaller than the sum of its proper divisors (182555400).

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

81832920 is a wasteful number, since it uses less digits than its factorization.

81832920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52484 (or 52480 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 81832920 is about 9046.1549843013. The cubic root of 81832920 is about 434.1528764098.

The spelling of 81832920 in words is "eighty-one million, eight hundred thirty-two thousand, nine hundred twenty".