64845857 has 4 divisors (see below), whose sum is σ = 64878660. Its totient is φ = 64813056.

The previous prime is 64845829. The next prime is 64845919. The reversal of 64845857 is 75854846.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75854846 = 2 ⋅37927423.

It can be written as a sum of positive squares in 2 ways, for example, as 30459361 + 34386496 = 5519^2 + 5864^2 .

It is a cyclic number.

It is not a de Polignac number, because 64845857 - 2⁸ = 64845601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64845817) 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, 13232 + ... + 17457.

It is an arithmetic number, because the mean of its divisors is an integer number (16219665).

Almost surely, 2^64845857 is an apocalyptic number.

It is an amenable number.

64845857 is a deficient number, since it is larger than the sum of its proper divisors (32803).

64845857 is a wasteful number, since it uses less digits than its factorization.

64845857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32802.

The product of its digits is 1075200, while the sum is 47.

The square root of 64845857 is about 8052.6925310731. The cubic root of 64845857 is about 401.7544951982.

The spelling of 64845857 in words is "sixty-four million, eight hundred forty-five thousand, eight hundred fifty-seven".