72557924 has 6 divisors (see below), whose sum is σ = 126976374. Its totient is φ = 36278960.

The previous prime is 72557923. The next prime is 72557929. The reversal of 72557924 is 42975527.

It can be written as a sum of positive squares in only one way, i.e., 72556324 + 1600 = 8518^2 + 40^2 .

It is not an unprimeable number, because it can be changed into a prime (72557923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9069737 + ... + 9069744.

It is an arithmetic number, because the mean of its divisors is an integer number (21162729).

Almost surely, 2^72557924 is an apocalyptic number.

It is an amenable number.

72557924 is a deficient number, since it is larger than the sum of its proper divisors (54418450).

72557924 is a wasteful number, since it uses less digits than its factorization.

72557924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18139485 (or 18139483 counting only the distinct ones).

The product of its digits is 176400, while the sum is 41.

The square root of 72557924 is about 8518.0939182425. The cubic root of 72557924 is about 417.0885645189.

The spelling of 72557924 in words is "seventy-two million, five hundred fifty-seven thousand, nine hundred twenty-four".