78918972 has 48 divisors (see below), whose sum is σ = 201436032. Its totient is φ = 23849280.

The previous prime is 78918953. The next prime is 78919007. The reversal of 78918972 is 27981987.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 71658 + ... + 72750.

It is an arithmetic number, because the mean of its divisors is an integer number (4196584).

Almost surely, 2^78918972 is an apocalyptic number.

It is an amenable number.

78918972 is an abundant number, since it is smaller than the sum of its proper divisors (122517060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78918972 is a wasteful number, since it uses less digits than its factorization.

78918972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1658 (or 1656 counting only the distinct ones).

The product of its digits is 508032, while the sum is 51.

The square root of 78918972 is about 8883.6350667956. The cubic root of 78918972 is about 428.9372928487.

The spelling of 78918972 in words is "seventy-eight million, nine hundred eighteen thousand, nine hundred seventy-two".