78683680 has 24 divisors (see below), whose sum is σ = 185890572. Its totient is φ = 31473408.

The previous prime is 78683677. The next prime is 78683681. The reversal of 78683680 is 8638687.

It can be written as a sum of positive squares in 2 ways, for example, as 75134224 + 3549456 = 8668^2 + 1884^2 .

It is a super-2 number, since 2×78683680² = 12382242996684800, which contains 22 as substring.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 78683680.

It is not an unprimeable number, because it can be changed into a prime (78683681) 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, 245727 + ... + 246046.

Almost surely, 2^78683680 is an apocalyptic number.

It is an amenable number.

78683680 is an abundant number, since it is smaller than the sum of its proper divisors (107206892).

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

78683680 is a wasteful number, since it uses less digits than its factorization.

78683680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491788 (or 491780 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 46.

The square root of 78683680 is about 8870.3821789143. The cubic root of 78683680 is about 428.5105852250.

The spelling of 78683680 in words is "seventy-eight million, six hundred eighty-three thousand, six hundred eighty".