64857539 has 8 divisors (see below), whose sum is σ = 68167680. Its totient is φ = 61588296.

The previous prime is 64857523. The next prime is 64857557. The reversal of 64857539 is 93575846.

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

It is not a de Polignac number, because 64857539 - 2⁴ = 64857523 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64857493 and 64857502.

It is not an unprimeable number, because it can be changed into a prime (64857589) 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, 6947 + ... + 13340.

It is an arithmetic number, because the mean of its divisors is an integer number (8520960).

Almost surely, 2^64857539 is an apocalyptic number.

64857539 is a deficient number, since it is larger than the sum of its proper divisors (3310141).

64857539 is a wasteful number, since it uses less digits than its factorization.

64857539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20449.

The product of its digits is 907200, while the sum is 47.

The square root of 64857539 is about 8053.4178458590. The cubic root of 64857539 is about 401.7786191460.

The spelling of 64857539 in words is "sixty-four million, eight hundred fifty-seven thousand, five hundred thirty-nine".