77656671 has 24 divisors (see below), whose sum is σ = 120288560. Its totient is φ = 49511088.

The previous prime is 77656633. The next prime is 77656681. The reversal of 77656671 is 17665677.

It is not a de Polignac number, because 77656671 - 2¹³ = 77648479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77656681) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11565 + ... + 17001.

Almost surely, 2^77656671 is an apocalyptic number.

77656671 is a deficient number, since it is larger than the sum of its proper divisors (42631889).

77656671 is a wasteful number, since it uses less digits than its factorization.

77656671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5492 (or 5463 counting only the distinct ones).

The product of its digits is 370440, while the sum is 45.

The square root of 77656671 is about 8812.3022531005. The cubic root of 77656671 is about 426.6380539759.

The spelling of 77656671 in words is "seventy-seven million, six hundred fifty-six thousand, six hundred seventy-one".