77687193979 has 8 divisors (see below), whose sum is σ = 78547370048. Its totient is φ = 76828227840.

The previous prime is 77687193973. The next prime is 77687194007. The reversal of 77687193979 is 97939178677.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77687193979 - 2⁷ = 77687193851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77687193973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 173052 + ... + 430489.

It is an arithmetic number, because the mean of its divisors is an integer number (9818421256).

Almost surely, 2^77687193979 is an apocalyptic number.

77687193979 is a deficient number, since it is larger than the sum of its proper divisors (860176069).

77687193979 is a wasteful number, since it uses less digits than its factorization.

77687193979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604965.

The product of its digits is 252047376, while the sum is 73.

The spelling of 77687193979 in words is "seventy-seven billion, six hundred eighty-seven million, one hundred ninety-three thousand, nine hundred seventy-nine".