77945656 has 32 divisors (see below), whose sum is σ = 153146880. Its totient is φ = 37144800.

The previous prime is 77945653. The next prime is 77945683. The reversal of 77945656 is 65654977.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77945653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14271 + ... + 18961.

It is an arithmetic number, because the mean of its divisors is an integer number (4785840).

Almost surely, 2^77945656 is an apocalyptic number.

It is an amenable number.

77945656 is a deficient number, since it is larger than the sum of its proper divisors (75201224).

77945656 is a wasteful number, since it uses less digits than its factorization.

77945656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4795 (or 4791 counting only the distinct ones).

The product of its digits is 1587600, while the sum is 49.

The square root of 77945656 is about 8828.6837070993. The cubic root of 77945656 is about 427.1666171832.

The spelling of 77945656 in words is "seventy-seven million, nine hundred forty-five thousand, six hundred fifty-six".