72057228 has 24 divisors (see below), whose sum is σ = 173932080. Its totient is φ = 23190720.

The previous prime is 72057221. The next prime is 72057269. The reversal of 72057228 is 82275027.

It is not an unprimeable number, because it can be changed into a prime (72057221) 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, 103183 + ... + 103878.

It is an arithmetic number, because the mean of its divisors is an integer number (7247170).

Almost surely, 2^72057228 is an apocalyptic number.

It is an amenable number.

72057228 is an abundant number, since it is smaller than the sum of its proper divisors (101874852).

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

72057228 is a wasteful number, since it uses less digits than its factorization.

72057228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207097 (or 207095 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 33.

The square root of 72057228 is about 8488.6528966615. The cubic root of 72057228 is about 416.1269567513.

It can be divided in two parts, 720572 and 28, that added together give a triangular number (720600 = T₁₂₀₀).

The spelling of 72057228 in words is "seventy-two million, fifty-seven thousand, two hundred twenty-eight".