77708857 has 8 divisors (see below), whose sum is σ = 79141536. Its totient is φ = 76289472.

The previous prime is 77708849. The next prime is 77708863. The reversal of 77708857 is 75880777.

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 77708857 - 2³ = 77708849 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77708857.

It is not an unprimeable number, because it can be changed into a prime (77708867) 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, 8878 + ... + 15304.

It is an arithmetic number, because the mean of its divisors is an integer number (9892692).

Almost surely, 2^77708857 is an apocalyptic number.

It is an amenable number.

77708857 is a deficient number, since it is larger than the sum of its proper divisors (1432679).

77708857 is a wasteful number, since it uses less digits than its factorization.

77708857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6647.

The product of its (nonzero) digits is 768320, while the sum is 49.

The square root of 77708857 is about 8815.2627300609. The cubic root of 77708857 is about 426.7336008136.

The spelling of 77708857 in words is "seventy-seven million, seven hundred eight thousand, eight hundred fifty-seven".