72220538 has 16 divisors (see below), whose sum is σ = 117282816. Its totient is φ = 33155760.

The previous prime is 72220537. The next prime is 72220549. The reversal of 72220538 is 83502227.

It is a super-2 number, since 2×72220538² = 10431612218018888, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 72220538.

It is not an unprimeable number, because it can be changed into a prime (72220531) 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, 2306 + ... + 12237.

It is an arithmetic number, because the mean of its divisors is an integer number (7330176).

Almost surely, 2^72220538 is an apocalyptic number.

72220538 is a deficient number, since it is larger than the sum of its proper divisors (45062278).

72220538 is a wasteful number, since it uses less digits than its factorization.

72220538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14749.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 72220538 is about 8498.2667644644. The cubic root of 72220538 is about 416.4410886347.

The spelling of 72220538 in words is "seventy-two million, two hundred twenty thousand, five hundred thirty-eight".