78979172 has 12 divisors (see below), whose sum is σ = 139582716. Its totient is φ = 39098400.

The previous prime is 78979157. The next prime is 78979177. The reversal of 78979172 is 27197987.

It can be written as a sum of positive squares in 2 ways, for example, as 34035556 + 44943616 = 5834^2 + 6704^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 78979172.

It is not an unprimeable number, because it can be changed into a prime (78979177) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97343 + ... + 98150.

It is an arithmetic number, because the mean of its divisors is an integer number (11631893).

Almost surely, 2^78979172 is an apocalyptic number.

It is an amenable number.

78979172 is a deficient number, since it is larger than the sum of its proper divisors (60603544).

78979172 is a wasteful number, since it uses less digits than its factorization.

78979172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195598 (or 195596 counting only the distinct ones).

The product of its digits is 444528, while the sum is 50.

The square root of 78979172 is about 8887.0226735392. The cubic root of 78979172 is about 429.0463306859.

The spelling of 78979172 in words is "seventy-eight million, nine hundred seventy-nine thousand, one hundred seventy-two".