77384879439 has 16 divisors (see below), whose sum is σ = 117959232000. Its totient is φ = 44205150240.

The previous prime is 77384879381. The next prime is 77384879447. The reversal of 77384879439 is 93497848377.

It is a happy number.

It is not a de Polignac number, because 77384879439 - 2²³ = 77376490831 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77384879479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 551392 + ... + 677349.

It is an arithmetic number, because the mean of its divisors is an integer number (7372452000).

Almost surely, 2^77384879439 is an apocalyptic number.

77384879439 is a deficient number, since it is larger than the sum of its proper divisors (40574352561).

77384879439 is a wasteful number, since it uses less digits than its factorization.

77384879439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1231750.

The product of its digits is 256048128, while the sum is 69.

The spelling of 77384879439 in words is "seventy-seven billion, three hundred eighty-four million, eight hundred seventy-nine thousand, four hundred thirty-nine".