77680939 has 16 divisors (see below), whose sum is σ = 95413248. Its totient is φ = 61725312.

The previous prime is 77680909. The next prime is 77680957. The reversal of 77680939 is 93908677.

It is a cyclic number.

It is not a de Polignac number, because 77680939 - 2²³ = 69292331 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77680892 and 77680901.

It is not an unprimeable number, because it can be changed into a prime (77680909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3102 + ... + 12844.

It is an arithmetic number, because the mean of its divisors is an integer number (5963328).

Almost surely, 2^77680939 is an apocalyptic number.

77680939 is a deficient number, since it is larger than the sum of its proper divisors (17732309).

77680939 is a wasteful number, since it uses less digits than its factorization.

77680939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9834.

The product of its (nonzero) digits is 571536, while the sum is 49.

The square root of 77680939 is about 8813.6790842417. The cubic root of 77680939 is about 426.6824913429.

The spelling of 77680939 in words is "seventy-seven million, six hundred eighty thousand, nine hundred thirty-nine".