77913857 has 8 divisors (see below), whose sum is σ = 92916096. Its totient is φ = 63879552.

The previous prime is 77913853. The next prime is 77913911. The reversal of 77913857 is 75831977.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77913857 - 2² = 77913853 is a prime.

It is a super-2 number, since 2×77913857² = 12141138225232898, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77913853) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 241808 + ... + 242129.

It is an arithmetic number, because the mean of its divisors is an integer number (11614512).

Almost surely, 2^77913857 is an apocalyptic number.

It is an amenable number.

77913857 is a deficient number, since it is larger than the sum of its proper divisors (15002239).

77913857 is a wasteful number, since it uses less digits than its factorization.

77913857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483967.

The product of its digits is 370440, while the sum is 47.

The square root of 77913857 is about 8826.8826320508. The cubic root of 77913857 is about 427.1085197874.

The spelling of 77913857 in words is "seventy-seven million, nine hundred thirteen thousand, eight hundred fifty-seven".