72561964 has 24 divisors (see below), whose sum is σ = 135743328. Its totient is φ = 33855360.

The previous prime is 72561911. The next prime is 72561977. The reversal of 72561964 is 46916527.

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, 5847 + ... + 13390.

It is an arithmetic number, because the mean of its divisors is an integer number (5655972).

Almost surely, 2^72561964 is an apocalyptic number.

It is an amenable number.

72561964 is a deficient number, since it is larger than the sum of its proper divisors (63181364).

72561964 is a wasteful number, since it uses less digits than its factorization.

72561964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19305 (or 19303 counting only the distinct ones).

The product of its digits is 90720, while the sum is 40.

The square root of 72561964 is about 8518.3310571966. The cubic root of 72561964 is about 417.0963054907.

The spelling of 72561964 in words is "seventy-two million, five hundred sixty-one thousand, nine hundred sixty-four".