77928673439 has 4 divisors (see below), whose sum is σ = 81316876656. Its totient is φ = 74540470224.

The previous prime is 77928673429. The next prime is 77928673463. The reversal of 77928673439 is 93437682977.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77928673439 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 (77928673429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1694101574 + ... + 1694101619.

It is an arithmetic number, because the mean of its divisors is an integer number (20329219164).

Almost surely, 2^77928673439 is an apocalyptic number.

77928673439 is a deficient number, since it is larger than the sum of its proper divisors (3388203217).

77928673439 is a wasteful number, since it uses less digits than its factorization.

77928673439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3388203216.

The product of its digits is 96018048, while the sum is 65.

The spelling of 77928673439 in words is "seventy-seven billion, nine hundred twenty-eight million, six hundred seventy-three thousand, four hundred thirty-nine".