78656 has 14 divisors (see below), whose sum is σ = 156210. Its totient is φ = 39296.

The previous prime is 78653. The next prime is 78691. The reversal of 78656 is 65687.

It can be written as a sum of positive squares in only one way, i.e., 78400 + 256 = 280^2 + 16^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an Ulam number.

It is a d-powerful number, because it can be written as 7 + 8³ + 6 + 5⁷ + 6 .

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 78656.

It is not an unprimeable number, because it can be changed into a prime (78653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 551 + ... + 678.

2⁷⁸⁶⁵⁶ is an apocalyptic number.

It is an amenable number.

78656 is a deficient number, since it is larger than the sum of its proper divisors (77554).

78656 is a wasteful number, since it uses less digits than its factorization.

78656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1241 (or 1231 counting only the distinct ones).

The product of its digits is 10080, while the sum is 32.

The square root of 78656 is about 280.4567702873. The cubic root of 78656 is about 42.8460330991.

The spelling of 78656 in words is "seventy-eight thousand, six hundred fifty-six".