77727656 has 16 divisors (see below), whose sum is σ = 150765300. Its totient is φ = 37523584.

The previous prime is 77727631. The next prime is 77727667. The reversal of 77727656 is 65672777.

It can be written as a sum of positive squares in 2 ways, for example, as 77616100 + 111556 = 8810^2 + 334^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 77727656.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 167285 + ... + 167748.

Almost surely, 2^77727656 is an apocalyptic number.

It is an amenable number.

77727656 is a deficient number, since it is larger than the sum of its proper divisors (73037644).

77727656 is a wasteful number, since it uses less digits than its factorization.

77727656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335068 (or 335064 counting only the distinct ones).

The product of its digits is 864360, while the sum is 47.

The square root of 77727656 is about 8816.3289412317. The cubic root of 77727656 is about 426.7680092387.

The spelling of 77727656 in words is "seventy-seven million, seven hundred twenty-seven thousand, six hundred fifty-six".