78552172 has 12 divisors (see below), whose sum is σ = 145552680. Its totient is φ = 36965696.

The previous prime is 78552169. The next prime is 78552191. The reversal of 78552172 is 27125587.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 577522 + ... + 577657.

It is an arithmetic number, because the mean of its divisors is an integer number (12129390).

Almost surely, 2^78552172 is an apocalyptic number.

It is an amenable number.

78552172 is a deficient number, since it is larger than the sum of its proper divisors (67000508).

78552172 is a wasteful number, since it uses less digits than its factorization.

78552172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1155200 (or 1155198 counting only the distinct ones).

The product of its digits is 39200, while the sum is 37.

The square root of 78552172 is about 8862.9663205949. The cubic root of 78552172 is about 428.2717216547.

The spelling of 78552172 in words is "seventy-eight million, five hundred fifty-two thousand, one hundred seventy-two".