78880656 has 20 divisors (see below), whose sum is σ = 203775152. Its totient is φ = 26293536.

The previous prime is 78880651. The next prime is 78880673. The reversal of 78880656 is 65608887.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 1643347 = 78880656 / (7 + 8 + 8 + 8 + 0 + 6 + 5 + 6).

It is not an unprimeable number, because it can be changed into a prime (78880651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 821626 + ... + 821721.

Almost surely, 2^78880656 is an apocalyptic number.

It is an amenable number.

78880656 is an abundant number, since it is smaller than the sum of its proper divisors (124894496).

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

78880656 is a wasteful number, since it uses less digits than its factorization.

78880656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1643358 (or 1643352 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 48.

The square root of 78880656 is about 8881.4782553357. The cubic root of 78880656 is about 428.8678637392.

The spelling of 78880656 in words is "seventy-eight million, eight hundred eighty thousand, six hundred fifty-six".