77687964 has 24 divisors (see below), whose sum is σ = 201413520. Its totient is φ = 25895952.

The previous prime is 77687957. The next prime is 77687993. The reversal of 77687964 is 46978677.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 77687964.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 359559 + ... + 359774.

It is an arithmetic number, because the mean of its divisors is an integer number (8392230).

Almost surely, 2^77687964 is an apocalyptic number.

It is an amenable number.

77687964 is an abundant number, since it is smaller than the sum of its proper divisors (123725556).

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

77687964 is a wasteful number, since it uses less digits than its factorization.

77687964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719346 (or 719338 counting only the distinct ones).

The product of its digits is 3556224, while the sum is 54.

The square root of 77687964 is about 8814.0776034705. The cubic root of 77687964 is about 426.6953531602.

The spelling of 77687964 in words is "seventy-seven million, six hundred eighty-seven thousand, nine hundred sixty-four".