64660857 has 16 divisors (see below), whose sum is σ = 91176960. Its totient is φ = 40647312.

The previous prime is 64660853. The next prime is 64660909. The reversal of 64660857 is 75806646.

It is a happy number.

It is not a de Polignac number, because 64660857 - 2² = 64660853 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64660853) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10168 + ... + 15254.

It is an arithmetic number, because the mean of its divisors is an integer number (5698560).

Almost surely, 2^64660857 is an apocalyptic number.

It is an amenable number.

64660857 is a deficient number, since it is larger than the sum of its proper divisors (26516103).

64660857 is a wasteful number, since it uses less digits than its factorization.

64660857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5332.

The product of its (nonzero) digits is 241920, while the sum is 42.

The square root of 64660857 is about 8041.1974854495. The cubic root of 64660857 is about 401.3720735706.

The spelling of 64660857 in words is "sixty-four million, six hundred sixty thousand, eight hundred fifty-seven".