81250928 has 20 divisors (see below), whose sum is σ = 171735288. Its totient is φ = 36932160.

The previous prime is 81250919. The next prime is 81250931. The reversal of 81250928 is 82905218.

It is a super-2 number, since 2×81250928² = 13203426601722368, which contains 22 as substring.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 230651 + ... + 231002.

Almost surely, 2^81250928 is an apocalyptic number.

81250928 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

81250928 is an abundant number, since it is smaller than the sum of its proper divisors (90484360).

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

81250928 is a wasteful number, since it uses less digits than its factorization.

81250928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461672 (or 461666 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 81250928 is about 9013.9296646912. The cubic root of 81250928 is about 433.1212016280.

The spelling of 81250928 in words is "eighty-one million, two hundred fifty thousand, nine hundred twenty-eight".