77656 has 16 divisors (see below), whose sum is σ = 154440. Its totient is φ = 36480.

The previous prime is 77647. The next prime is 77659. The reversal of 77656 is 65677.

It is a nialpdrome in base 5.

It is a zygodrome in base 5 and base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150 + ... + 421.

2⁷⁷⁶⁵⁶ is an apocalyptic number.

It is an amenable number.

77656 is a deficient number, since it is larger than the sum of its proper divisors (76784).

77656 is a wasteful number, since it uses less digits than its factorization.

77656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594 (or 590 counting only the distinct ones).

The product of its digits is 8820, while the sum is 31.

The square root of 77656 is about 278.6682615584. The cubic root of 77656 is about 42.6636825170.

The spelling of 77656 in words is "seventy-seven thousand, six hundred fifty-six".