64857 has 8 divisors (see below), whose sum is σ = 93184. Its totient is φ = 39888.

The previous prime is 64853. The next prime is 64871. The reversal of 64857 is 75846.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64857 - 2² = 64853 is a prime.

64857 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (64853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 793 + ... + 870.

It is an arithmetic number, because the mean of its divisors is an integer number (11648).

2⁶⁴⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

64857 is a deficient number, since it is larger than the sum of its proper divisors (28327).

64857 is a wasteful number, since it uses less digits than its factorization.

64857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1679.

The product of its digits is 6720, while the sum is 30.

The square root of 64857 is about 254.6703751911. The cubic root of 64857 is about 40.1777506146.

The spelling of 64857 in words is "sixty-four thousand, eight hundred fifty-seven".