77647640652 has 36 divisors (see below), whose sum is σ = 196292064696. Its totient is φ = 25880425920.

The previous prime is 77647640639. The next prime is 77647640659. The reversal of 77647640652 is 25604674677.

77647640652 is a `hidden beast` number, since 7 + 76 + 476 + 40 + 65 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (77647640659) 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, 392952 + ... + 556512.

Almost surely, 2^77647640652 is an apocalyptic number.

It is an amenable number.

77647640652 is an abundant number, since it is smaller than the sum of its proper divisors (118644424044).

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

77647640652 is a wasteful number, since it uses less digits than its factorization.

77647640652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176758 (or 176753 counting only the distinct ones).

The product of its (nonzero) digits is 11854080, while the sum is 54.

The spelling of 77647640652 in words is "seventy-seven billion, six hundred forty-seven million, six hundred forty thousand, six hundred fifty-two".