78677690 has 64 divisors (see below), whose sum is σ = 179988480. Its totient is φ = 24088320.

The previous prime is 78677681. The next prime is 78677701. The reversal of 78677690 is 9677687.

It is a super-2 number, since 2×78677690² = 12380357807472200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26816 + ... + 29604.

It is an arithmetic number, because the mean of its divisors is an integer number (2812320).

Almost surely, 2^78677690 is an apocalyptic number.

78677690 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

78677690 is an abundant number, since it is smaller than the sum of its proper divisors (101310790).

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

78677690 is a wasteful number, since it uses less digits than its factorization.

78677690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2847.

The product of its (nonzero) digits is 889056, while the sum is 50.

The square root of 78677690 is about 8870.0445320190. The cubic root of 78677690 is about 428.4997111211.

The spelling of 78677690 in words is "seventy-eight million, six hundred seventy-seven thousand, six hundred ninety".