81264924 has 48 divisors (see below), whose sum is σ = 226897440. Its totient is φ = 25004160.

The previous prime is 81264917. The next prime is 81264943. The reversal of 81264924 is 42946218.

81264924 is a `hidden beast` number, since 8 + 1 + 2 + 649 + 2 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27537 + ... + 30344.

It is an arithmetic number, because the mean of its divisors is an integer number (4727030).

Almost surely, 2^81264924 is an apocalyptic number.

It is an amenable number.

81264924 is an abundant number, since it is smaller than the sum of its proper divisors (145632516).

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

81264924 is a wasteful number, since it uses less digits than its factorization.

81264924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57907 (or 57899 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 81264924 is about 9014.7059852221. The cubic root of 81264924 is about 433.1460695135.

It can be divided in two parts, 8126492 and 4, that added together give a triangular number (8126496 = T₄₀₃₁).

The spelling of 81264924 in words is "eighty-one million, two hundred sixty-four thousand, nine hundred twenty-four".