77646680 has 32 divisors (see below), whose sum is σ = 175791600. Its totient is φ = 30865536.

The previous prime is 77646637. The next prime is 77646697. The reversal of 77646680 is 8664677.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 566 + ... + 12474.

Almost surely, 2^77646680 is an apocalyptic number.

It is an amenable number.

77646680 is an abundant number, since it is smaller than the sum of its proper divisors (98144920).

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

77646680 is a wasteful number, since it uses less digits than its factorization.

77646680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12083 (or 12079 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 44.

The square root of 77646680 is about 8811.7353568976. The cubic root of 77646680 is about 426.6197566699.

The spelling of 77646680 in words is "seventy-seven million, six hundred forty-six thousand, six hundred eighty".