77697639 has 12 divisors (see below), whose sum is σ = 112723000. Its totient is φ = 51570864.

The previous prime is 77697637. The next prime is 77697671. The reversal of 77697639 is 93679677.

It is not a de Polignac number, because 77697639 - 2¹ = 77697637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77697637) 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, 16789 + ... + 20910.

Almost surely, 2^77697639 is an apocalyptic number.

77697639 is a deficient number, since it is larger than the sum of its proper divisors (35025361).

77697639 is a wasteful number, since it uses less digits than its factorization.

77697639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37934 (or 37931 counting only the distinct ones).

The product of its digits is 3000564, while the sum is 54.

The square root of 77697639 is about 8814.6264243018. The cubic root of 77697639 is about 426.7130654971.

The spelling of 77697639 in words is "seventy-seven million, six hundred ninety-seven thousand, six hundred thirty-nine".