72556020 has 48 divisors (see below), whose sum is σ = 225731520. Its totient is φ = 19348128.

The previous prime is 72556009. The next prime is 72556021. The reversal of 72556020 is 2065527.

72556020 is a `hidden beast` number, since 7 + 2 + 55 + 602 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72556021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66642 + ... + 67721.

It is an arithmetic number, because the mean of its divisors is an integer number (4702740).

Almost surely, 2^72556020 is an apocalyptic number.

It is an amenable number.

72556020 is an abundant number, since it is smaller than the sum of its proper divisors (153175500).

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

72556020 is a wasteful number, since it uses less digits than its factorization.

72556020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134381 (or 134373 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 72556020 is about 8517.9821554169. The cubic root of 72556020 is about 417.0849161989.

The spelling of 72556020 in words is "seventy-two million, five hundred fifty-six thousand, twenty".