72557930 has 16 divisors (see below), whose sum is σ = 131362344. Its totient is φ = 28854720.

The previous prime is 72557929. The next prime is 72557957. The reversal of 72557930 is 3975527.

It can be written as a sum of positive squares in 4 ways, for example, as 52693081 + 19864849 = 7259^2 + 4457^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19241 + ... + 22700.

Almost surely, 2^72557930 is an apocalyptic number.

72557930 is a deficient number, since it is larger than the sum of its proper divisors (58804414).

72557930 is a wasteful number, since it uses less digits than its factorization.

72557930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42121.

The product of its (nonzero) digits is 66150, while the sum is 38.

The square root of 72557930 is about 8518.0942704340. The cubic root of 72557930 is about 417.0885760156.

The spelling of 72557930 in words is "seventy-two million, five hundred fifty-seven thousand, nine hundred thirty".