77809689 has 12 divisors (see below), whose sum is σ = 113022000. Its totient is φ = 51582264.

The previous prime is 77809679. The next prime is 77809703. The reversal of 77809689 is 98690877.

It is not a de Polignac number, because 77809689 - 2⁴ = 77809673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77809619) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22539 + ... + 25760.

It is an arithmetic number, because the mean of its divisors is an integer number (9418500).

Almost surely, 2^77809689 is an apocalyptic number.

It is an amenable number.

77809689 is a deficient number, since it is larger than the sum of its proper divisors (35212311).

77809689 is a wasteful number, since it uses less digits than its factorization.

77809689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48484 (or 48481 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 54.

The square root of 77809689 is about 8820.9800475911. The cubic root of 77809689 is about 426.9180920322.

The spelling of 77809689 in words is "seventy-seven million, eight hundred nine thousand, six hundred eighty-nine".