77877621628 has 12 divisors (see below), whose sum is σ = 136287911032. Its totient is φ = 38938218480.

The previous prime is 77877621607. The next prime is 77877621677. The reversal of 77877621628 is 82612677877.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 295126 + ... + 492802.

Almost surely, 2^77877621628 is an apocalyptic number.

It is an amenable number.

77877621628 is a deficient number, since it is larger than the sum of its proper divisors (58410289404).

77877621628 is a wasteful number, since it uses less digits than its factorization.

77877621628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296172 (or 296170 counting only the distinct ones).

The product of its digits is 22127616, while the sum is 61.

The spelling of 77877621628 in words is "seventy-seven billion, eight hundred seventy-seven million, six hundred twenty-one thousand, six hundred twenty-eight".