72556812 has 36 divisors (see below), whose sum is σ = 191383920. Its totient is φ = 23133792.

The previous prime is 72556769. The next prime is 72556819. The reversal of 72556812 is 21865527.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is not an unprimeable number, because it can be changed into a prime (72556819) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42987 + ... + 44642.

It is an arithmetic number, because the mean of its divisors is an integer number (5316220).

Almost surely, 2^72556812 is an apocalyptic number.

It is an amenable number.

72556812 is an abundant number, since it is smaller than the sum of its proper divisors (118827108).

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

72556812 is a wasteful number, since it uses less digits than its factorization.

72556812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87662 (or 87657 counting only the distinct ones).

The product of its digits is 33600, while the sum is 36.

The square root of 72556812 is about 8518.0286451737. The cubic root of 72556812 is about 417.0864337851.

The spelling of 72556812 in words is "seventy-two million, five hundred fifty-six thousand, eight hundred twelve".