72160225 has 6 divisors (see below), whose sum is σ = 89478710. Its totient is φ = 57728160.

The previous prime is 72160217. The next prime is 72160247. The reversal of 72160225 is 52206127.

It can be written as a sum of positive squares in 3 ways, for example, as 16224784 + 55935441 = 4028^2 + 7479^2 .

It is not a de Polignac number, because 72160225 - 2³ = 72160217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 2886409 = 72160225 / (7 + 2 + 1 + 6 + 0 + 2 + 2 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 72160225.

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, 1443180 + ... + 1443229.

Almost surely, 2^72160225 is an apocalyptic number.

It is an amenable number.

72160225 is a deficient number, since it is larger than the sum of its proper divisors (17318485).

72160225 is a wasteful number, since it uses less digits than its factorization.

72160225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2886419 (or 2886414 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 72160225 is about 8494.7174761731. The cubic root of 72160225 is about 416.3251299006.

The spelling of 72160225 in words is "seventy-two million, one hundred sixty thousand, two hundred twenty-five".