77136839 has 12 divisors (see below), whose sum is σ = 86412600. Its totient is φ = 68743584.

The previous prime is 77136833. The next prime is 77136841. The reversal of 77136839 is 93863177.

It is a de Polignac number, because none of the positive numbers 2^k-77136839 is a prime.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77136839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77136833) 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, 2969 + ... + 12770.

It is an arithmetic number, because the mean of its divisors is an integer number (7201050).

Almost surely, 2^77136839 is an apocalyptic number.

77136839 is a deficient number, since it is larger than the sum of its proper divisors (9275761).

77136839 is a wasteful number, since it uses less digits than its factorization.

77136839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15794 (or 15781 counting only the distinct ones).

The product of its digits is 190512, while the sum is 44.

The square root of 77136839 is about 8782.7580520017. The cubic root of 77136839 is about 425.6839533932.

The spelling of 77136839 in words is "seventy-seven million, one hundred thirty-six thousand, eight hundred thirty-nine".