77397817968 has 60 divisors (see below), whose sum is σ = 220157342808. Its totient is φ = 25376330880.

The previous prime is 77397817961. The next prime is 77397817969. The reversal of 77397817968 is 86971879377.

77397817968 is a `hidden beast` number, since 7 + 7 + 397 + 8 + 179 + 68 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 77397817896 and 77397817905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77397817961) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4396830 + ... + 4414397.

Almost surely, 2^77397817968 is an apocalyptic number.

It is an amenable number.

77397817968 is an abundant number, since it is smaller than the sum of its proper divisors (142759524840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77397817968 is a wasteful number, since it uses less digits than its factorization.

77397817968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8811302 (or 8811293 counting only the distinct ones).

The product of its digits is 224042112, while the sum is 72.

The spelling of 77397817968 in words is "seventy-seven billion, three hundred ninety-seven million, eight hundred seventeen thousand, nine hundred sixty-eight".