72556220 has 24 divisors (see below), whose sum is σ = 166220208. Its totient is φ = 26384000.

The previous prime is 72556219. The next prime is 72556229. The reversal of 72556220 is 2265527.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72556229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164681 + ... + 165120.

It is an arithmetic number, because the mean of its divisors is an integer number (6925842).

Almost surely, 2^72556220 is an apocalyptic number.

It is an amenable number.

72556220 is an abundant number, since it is smaller than the sum of its proper divisors (93663988).

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

72556220 is a wasteful number, since it uses less digits than its factorization.

72556220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329821 (or 329819 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 72556220 is about 8517.9938952784. The cubic root of 72556220 is about 417.0852994288.

The spelling of 72556220 in words is "seventy-two million, five hundred fifty-six thousand, two hundred twenty".