77766957 has 12 divisors (see below), whose sum is σ = 113421984. Its totient is φ = 51340680.

The previous prime is 77766947. The next prime is 77766961. The reversal of 77766957 is 75966777.

It is not a de Polignac number, because 77766957 - 2⁸ = 77766701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77766907) 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 11 ways as a sum of consecutive naturals, for example, 41019 + ... + 42872.

It is an arithmetic number, because the mean of its divisors is an integer number (9451832).

Almost surely, 2^77766957 is an apocalyptic number.

It is an amenable number.

77766957 is a deficient number, since it is larger than the sum of its proper divisors (35655027).

77766957 is a wasteful number, since it uses less digits than its factorization.

77766957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84000 (or 83997 counting only the distinct ones).

The product of its digits is 3889620, while the sum is 54.

The square root of 77766957 is about 8818.5575351074. The cubic root of 77766957 is about 426.8399252265.

The spelling of 77766957 in words is "seventy-seven million, seven hundred sixty-six thousand, nine hundred fifty-seven".