77656997 has 4 divisors (see below), whose sum is σ = 84716736. Its totient is φ = 70597260.

The previous prime is 77656991. The next prime is 77657017. The reversal of 77656997 is 79965677.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 77656997 - 2⁸ = 77656741 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 (77656991) 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 3 ways as a sum of consecutive naturals, for example, 3529853 + ... + 3529874.

It is an arithmetic number, because the mean of its divisors is an integer number (21179184).

Almost surely, 2^77656997 is an apocalyptic number.

It is an amenable number.

77656997 is a deficient number, since it is larger than the sum of its proper divisors (7059739).

77656997 is a wasteful number, since it uses less digits than its factorization.

77656997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7059738.

The product of its digits is 5000940, while the sum is 56.

The square root of 77656997 is about 8812.3207499500. The cubic root of 77656997 is about 426.6386509789.

The spelling of 77656997 in words is "seventy-seven million, six hundred fifty-six thousand, nine hundred ninety-seven".