78007656 has 32 divisors (see below), whose sum is σ = 201312000. Its totient is φ = 25163520.

The previous prime is 78007649. The next prime is 78007661. The reversal of 78007656 is 65670087.

It is a super-2 number, since 2×78007656² = 12170388789228672, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

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, 51681 + ... + 53168.

It is an arithmetic number, because the mean of its divisors is an integer number (6291000).

Almost surely, 2^78007656 is an apocalyptic number.

It is an amenable number.

78007656 is an abundant number, since it is smaller than the sum of its proper divisors (123304344).

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

78007656 is a wasteful number, since it uses less digits than its factorization.

78007656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104889 (or 104885 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 39.

The square root of 78007656 is about 8832.1942913412. The cubic root of 78007656 is about 427.2798469752.

The spelling of 78007656 in words is "seventy-eight million, seven thousand, six hundred fifty-six".