77991715290 has 16 divisors (see below), whose sum is σ = 187180116768. Its totient is φ = 20797790736.

The previous prime is 77991715283. The next prime is 77991715313. The reversal of 77991715290 is 9251719977.

It is a self number, because there is not a number n which added to its sum of digits gives 77991715290.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1299861892 + ... + 1299861951.

It is an arithmetic number, because the mean of its divisors is an integer number (11698757298).

Almost surely, 2^77991715290 is an apocalyptic number.

77991715290 is an abundant number, since it is smaller than the sum of its proper divisors (109188401478).

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

77991715290 is a wasteful number, since it uses less digits than its factorization.

77991715290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2599723853.

The product of its (nonzero) digits is 2500470, while the sum is 57.

The spelling of 77991715290 in words is "seventy-seven billion, nine hundred ninety-one million, seven hundred fifteen thousand, two hundred ninety".