78682978 has 16 divisors (see below), whose sum is σ = 129276000. Its totient is φ = 35620000.

The previous prime is 78682969. The next prime is 78682997. The reversal of 78682978 is 87928687.

It is a super-2 number, since 2×78682978² = 12382022053896968, which contains 22 as substring.

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, 1603 + ... + 12646.

It is an arithmetic number, because the mean of its divisors is an integer number (8079750).

Almost surely, 2^78682978 is an apocalyptic number.

78682978 is a deficient number, since it is larger than the sum of its proper divisors (50593022).

78682978 is a wasteful number, since it uses less digits than its factorization.

78682978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14513.

The product of its digits is 2709504, while the sum is 55.

The square root of 78682978 is about 8870.3426089413. The cubic root of 78682978 is about 428.5093108594.

The spelling of 78682978 in words is "seventy-eight million, six hundred eighty-two thousand, nine hundred seventy-eight".