77945997 has 16 divisors (see below), whose sum is σ = 110983680. Its totient is φ = 48552000.

The previous prime is 77945981. The next prime is 77946007. The reversal of 77945997 is 79954977.

It is not a de Polignac number, because 77945997 - 2⁴ = 77945981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77945927) 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 15 ways as a sum of consecutive naturals, for example, 11754 + ... + 17147.

It is an arithmetic number, because the mean of its divisors is an integer number (6936480).

Almost surely, 2^77945997 is an apocalyptic number.

It is an amenable number.

77945997 is a deficient number, since it is larger than the sum of its proper divisors (33037683).

77945997 is a wasteful number, since it uses less digits than its factorization.

77945997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28964.

The product of its digits is 5000940, while the sum is 57.

The square root of 77945997 is about 8828.7030191303. The cubic root of 77945997 is about 427.1672401112.

The spelling of 77945997 in words is "seventy-seven million, nine hundred forty-five thousand, nine hundred ninety-seven".