78331916 has 24 divisors (see below), whose sum is σ = 152390784. Its totient is φ = 34986240.

The previous prime is 78331907. The next prime is 78331961. The reversal of 78331916 is 61913387.

It is a super-2 number, since 2×78331916² = 12271778128462112, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78331916.

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, 22685 + ... + 25908.

It is an arithmetic number, because the mean of its divisors is an integer number (6349616).

Almost surely, 2^78331916 is an apocalyptic number.

It is an amenable number.

78331916 is a deficient number, since it is larger than the sum of its proper divisors (74058868).

78331916 is a wasteful number, since it uses less digits than its factorization.

78331916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48641 (or 48639 counting only the distinct ones).

The product of its digits is 27216, while the sum is 38.

The square root of 78331916 is about 8850.5319614134. The cubic root of 78331916 is about 427.8710634410.

The spelling of 78331916 in words is "seventy-eight million, three hundred thirty-one thousand, nine hundred sixteen".