72520556 has 12 divisors (see below), whose sum is σ = 127911168. Its totient is φ = 35974512.

The previous prime is 72520543. The next prime is 72520559. The reversal of 72520556 is 65502527.

It is not an unprimeable number, because it can be changed into a prime (72520559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70871 + ... + 71886.

It is an arithmetic number, because the mean of its divisors is an integer number (10659264).

Almost surely, 2^72520556 is an apocalyptic number.

It is an amenable number.

72520556 is a deficient number, since it is larger than the sum of its proper divisors (55390612).

72520556 is a wasteful number, since it uses less digits than its factorization.

72520556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142888 (or 142886 counting only the distinct ones).

The product of its (nonzero) digits is 21000, while the sum is 32.

The square root of 72520556 is about 8515.9001872967. The cubic root of 72520556 is about 417.0169507378.

The spelling of 72520556 in words is "seventy-two million, five hundred twenty thousand, five hundred fifty-six".