64866857 has 4 divisors (see below), whose sum is σ = 70763856. Its totient is φ = 58969860.

The previous prime is 64866829. The next prime is 64866871. The reversal of 64866857 is 75866846.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64866857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64866827) 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, 2948483 + ... + 2948504.

It is an arithmetic number, because the mean of its divisors is an integer number (17690964).

Almost surely, 2^64866857 is an apocalyptic number.

It is an amenable number.

64866857 is a deficient number, since it is larger than the sum of its proper divisors (5896999).

64866857 is a wasteful number, since it uses less digits than its factorization.

64866857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5896998.

The product of its digits is 1935360, while the sum is 50.

The square root of 64866857 is about 8053.9963372229. The cubic root of 64866857 is about 401.7978592321.

The spelling of 64866857 in words is "sixty-four million, eight hundred sixty-six thousand, eight hundred fifty-seven".