77956680 has 32 divisors (see below), whose sum is σ = 233870400. Its totient is φ = 20788416.

The previous prime is 77956667. The next prime is 77956687. The reversal of 77956680 is 8665977.

It is not an unprimeable number, because it can be changed into a prime (77956687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 324700 + ... + 324939.

It is an arithmetic number, because the mean of its divisors is an integer number (7308450).

Almost surely, 2^77956680 is an apocalyptic number.

It is an amenable number.

77956680 is an abundant number, since it is smaller than the sum of its proper divisors (155913720).

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

77956680 is a wasteful number, since it uses less digits than its factorization.

77956680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649653 (or 649649 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 48.

The square root of 77956680 is about 8829.3080136554. The cubic root of 77956680 is about 427.1867545585.

The spelling of 77956680 in words is "seventy-seven million, nine hundred fifty-six thousand, six hundred eighty".