81925256 has 24 divisors (see below), whose sum is σ = 178689870. Its totient is φ = 35110656.

The previous prime is 81925247. The next prime is 81925279. The reversal of 81925256 is 65252918.

It can be written as a sum of positive squares in only one way, i.e., 43112356 + 38812900 = 6566^2 + 6230^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 104105 + ... + 104888.

Almost surely, 2^81925256 is an apocalyptic number.

It is an amenable number.

81925256 is an abundant number, since it is smaller than the sum of its proper divisors (96764614).

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

81925256 is a wasteful number, since it uses less digits than its factorization.

81925256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209013 (or 209002 counting only the distinct ones).

The product of its digits is 43200, while the sum is 38.

The square root of 81925256 is about 9051.2571502527. The cubic root of 81925256 is about 434.3161068543.

The spelling of 81925256 in words is "eighty-one million, nine hundred twenty-five thousand, two hundred fifty-six".