72170152 has 8 divisors (see below), whose sum is σ = 135319050. Its totient is φ = 36085072.

The previous prime is 72170149. The next prime is 72170173. The reversal of 72170152 is 25107127.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 51065316 + 21104836 = 7146^2 + 4594^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4510627 + ... + 4510642.

Almost surely, 2^72170152 is an apocalyptic number.

It is an amenable number.

72170152 is a deficient number, since it is larger than the sum of its proper divisors (63148898).

72170152 is a wasteful number, since it uses less digits than its factorization.

72170152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9021275 (or 9021271 counting only the distinct ones).

The product of its (nonzero) digits is 980, while the sum is 25.

The square root of 72170152 is about 8495.3017603850. The cubic root of 72170152 is about 416.3442201499.

Adding to 72170152 its reverse (25107127), we get a palindrome (97277279).

The spelling of 72170152 in words is "seventy-two million, one hundred seventy thousand, one hundred fifty-two".