77990857 has 8 divisors (see below), whose sum is σ = 91541696. Its totient is φ = 65042352.

The previous prime is 77990833. The next prime is 77990893. The reversal of 77990857 is 75809977.

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 77990857 - 2²³ = 69602249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77990807) 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, 150303 + ... + 150820.

It is an arithmetic number, because the mean of its divisors is an integer number (11442712).

Almost surely, 2^77990857 is an apocalyptic number.

It is an amenable number.

77990857 is a deficient number, since it is larger than the sum of its proper divisors (13550839).

77990857 is a wasteful number, since it uses less digits than its factorization.

77990857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301167.

The product of its (nonzero) digits is 1111320, while the sum is 52.

The square root of 77990857 is about 8831.2432307122. The cubic root of 77990857 is about 427.2491731079.

The spelling of 77990857 in words is "seventy-seven million, nine hundred ninety thousand, eight hundred fifty-seven".