77647736620 has 96 divisors (see below), whose sum is σ = 173224658880. Its totient is φ = 29154401280.

The previous prime is 77647736587. The next prime is 77647736659. The reversal of 77647736620 is 2663774677.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20150614 + ... + 20154466.

It is an arithmetic number, because the mean of its divisors is an integer number (1804423530).

Almost surely, 2^77647736620 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77647736620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86612329440).

77647736620 is an abundant number, since it is smaller than the sum of its proper divisors (95576922260).

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

77647736620 is a wasteful number, since it uses less digits than its factorization.

77647736620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4355 (or 4353 counting only the distinct ones).

The product of its (nonzero) digits is 12446784, while the sum is 55.

The spelling of 77647736620 in words is "seventy-seven billion, six hundred forty-seven million, seven hundred thirty-six thousand, six hundred twenty".