77681968280 has 64 divisors (see below), whose sum is σ = 200008016640. Its totient is φ = 26599900032.

The previous prime is 77681968279. The next prime is 77681968283. The reversal of 77681968280 is 8286918677.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77681968283) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44099 + ... + 396621.

It is an arithmetic number, because the mean of its divisors is an integer number (3125125260).

Almost surely, 2^77681968280 is an apocalyptic number.

77681968280 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

77681968280 is an abundant number, since it is smaller than the sum of its proper divisors (122326048360).

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

77681968280 is a wasteful number, since it uses less digits than its factorization.

77681968280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353328 (or 353324 counting only the distinct ones).

The product of its (nonzero) digits is 16257024, while the sum is 62.

The spelling of 77681968280 in words is "seventy-seven billion, six hundred eighty-one million, nine hundred sixty-eight thousand, two hundred eighty".