72166625 has 8 divisors (see below), whose sum is σ = 90064104. Its totient is φ = 57733200.

The previous prime is 72166603. The next prime is 72166637. The reversal of 72166625 is 52666127.

It can be written as a sum of positive squares in 4 ways, for example, as 5841889 + 66324736 = 2417^2 + 8144^2 .

It is not a de Polignac number, because 72166625 - 2⁶ = 72166561 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 288542 + ... + 288791.

It is an arithmetic number, because the mean of its divisors is an integer number (11258013).

Almost surely, 2^72166625 is an apocalyptic number.

It is an amenable number.

72166625 is a deficient number, since it is larger than the sum of its proper divisors (17897479).

72166625 is an equidigital number, since it uses as much as digits as its factorization.

72166625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577348 (or 577338 counting only the distinct ones).

The product of its digits is 30240, while the sum is 35.

The square root of 72166625 is about 8495.0941725210. The cubic root of 72166625 is about 416.3374377062.

The spelling of 72166625 in words is "seventy-two million, one hundred sixty-six thousand, six hundred twenty-five".