77900979 has 16 divisors (see below), whose sum is σ = 112492800. Its totient is φ = 47666976.

The previous prime is 77900971. The next prime is 77900981. The reversal of 77900979 is 97900977.

It is not a de Polignac number, because 77900979 - 2³ = 77900971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77900971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1402 + ... + 12560.

It is an arithmetic number, because the mean of its divisors is an integer number (7030800).

Almost surely, 2^77900979 is an apocalyptic number.

77900979 is a deficient number, since it is larger than the sum of its proper divisors (34591821).

77900979 is a wasteful number, since it uses less digits than its factorization.

77900979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11354.

The product of its (nonzero) digits is 250047, while the sum is 48.

The square root of 77900979 is about 8826.1531257961. The cubic root of 77900979 is about 427.0849869321.

The spelling of 77900979 in words is "seventy-seven million, nine hundred thousand, nine hundred seventy-nine".