78677277687 has 6 divisors (see below), whose sum is σ = 113644956672. Its totient is φ = 52451518452.

The previous prime is 78677277659. The next prime is 78677277689.

78677277687 is nontrivially palindromic in base 10.

It is a de Polignac number, because none of the positive numbers 2^k-78677277687 is a prime.

It is a super-2 number, since 2×78677277687² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78677277689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4370959863 + ... + 4370959880.

It is an arithmetic number, because the mean of its divisors is an integer number (18940826112).

Almost surely, 2^78677277687 is an apocalyptic number.

78677277687 is a deficient number, since it is larger than the sum of its proper divisors (34967678985).

78677277687 is a wasteful number, since it uses less digits than its factorization.

78677277687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8741919749 (or 8741919746 counting only the distinct ones).

The product of its digits is 542126592, while the sum is 72.

The spelling of 78677277687 in words is "seventy-eight billion, six hundred seventy-seven million, two hundred seventy-seven thousand, six hundred eighty-seven".