77968577 has 4 divisors (see below), whose sum is σ = 77992020. Its totient is φ = 77945136.

The previous prime is 77968573. The next prime is 77968591. The reversal of 77968577 is 77586977.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25897921 + 52070656 = 5089^2 + 7216^2 .

It is a cyclic number.

It is not a de Polignac number, because 77968577 - 2² = 77968573 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77968573) 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, 5702 + ... + 13727.

It is an arithmetic number, because the mean of its divisors is an integer number (19498005).

Almost surely, 2^77968577 is an apocalyptic number.

It is an amenable number.

77968577 is a deficient number, since it is larger than the sum of its proper divisors (23443).

77968577 is a wasteful number, since it uses less digits than its factorization.

77968577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23442.

The product of its digits is 5186160, while the sum is 56.

The square root of 77968577 is about 8829.9817100603. The cubic root of 77968577 is about 427.2084845001.

The spelling of 77968577 in words is "seventy-seven million, nine hundred sixty-eight thousand, five hundred seventy-seven".