78792172 has 12 divisors (see below), whose sum is σ = 137951856. Its totient is φ = 39377360.

The previous prime is 78792169. The next prime is 78792187. The reversal of 78792172 is 27129787.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9678 + ... + 15850.

It is an arithmetic number, because the mean of its divisors is an integer number (11495988).

Almost surely, 2^78792172 is an apocalyptic number.

It is an amenable number.

78792172 is a deficient number, since it is larger than the sum of its proper divisors (59159684).

78792172 is a wasteful number, since it uses less digits than its factorization.

78792172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9368 (or 9366 counting only the distinct ones).

The product of its digits is 98784, while the sum is 43.

The square root of 78792172 is about 8876.4954796361. The cubic root of 78792172 is about 428.7074435799.

The spelling of 78792172 in words is "seventy-eight million, seven hundred ninety-two thousand, one hundred seventy-two".