72157204 has 18 divisors (see below), whose sum is σ = 146891850. Its totient is φ = 30924432.

The previous prime is 72157199. The next prime is 72157271. The reversal of 72157204 is 40275127.

It can be written as a sum of positive squares in only one way, i.e., 39690000 + 32467204 = 6300^2 + 5698^2 .

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 183879 + ... + 184270.

Almost surely, 2^72157204 is an apocalyptic number.

It is an amenable number.

72157204 is an abundant number, since it is smaller than the sum of its proper divisors (74734646).

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

72157204 is a wasteful number, since it uses less digits than its factorization.

72157204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368167 (or 368158 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 28.

The square root of 72157204 is about 8494.5396579214. The cubic root of 72157204 is about 416.3193199789.

It can be divided in two parts, 72157 and 204, that added together give a square (72361 = 269²).

The spelling of 72157204 in words is "seventy-two million, one hundred fifty-seven thousand, two hundred four".