77656568 has 16 divisors (see below), whose sum is σ = 158843160. Its totient is φ = 35298400.

The previous prime is 77656559. The next prime is 77656619. The reversal of 77656568 is 86565677.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 441143 + ... + 441318.

Almost surely, 2^77656568 is an apocalyptic number.

It is an amenable number.

77656568 is an abundant number, since it is smaller than the sum of its proper divisors (81186592).

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

77656568 is a wasteful number, since it uses less digits than its factorization.

77656568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 882478 (or 882474 counting only the distinct ones).

The product of its digits is 2116800, while the sum is 50.

The square root of 77656568 is about 8812.2964089958. The cubic root of 77656568 is about 426.6378653519.

The spelling of 77656568 in words is "seventy-seven million, six hundred fifty-six thousand, five hundred sixty-eight".