78931656 has 48 divisors (see below), whose sum is σ = 219558300. Its totient is φ = 25598592.

The previous prime is 78931631. The next prime is 78931667. The reversal of 78931656 is 65613987.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 63202500 + 15729156 = 7950^2 + 3966^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12151 + ... + 17478.

Almost surely, 2^78931656 is an apocalyptic number.

It is an amenable number.

78931656 is an abundant number, since it is smaller than the sum of its proper divisors (140626644).

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

78931656 is a wasteful number, since it uses less digits than its factorization.

78931656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29678 (or 29671 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 78931656 is about 8884.3489350655. The cubic root of 78931656 is about 428.9602714770.

The spelling of 78931656 in words is "seventy-eight million, nine hundred thirty-one thousand, six hundred fifty-six".