64685 has 8 divisors (see below), whose sum is σ = 82296. Its totient is φ = 48640.

The previous prime is 64679. The next prime is 64693. The reversal of 64685 is 58646.

64685 = 26² + 27² + ... + 59².

It can be written as a sum of positive squares in 4 ways, for example, as 676 + 64009 = 26^2 + 253^2 .

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

It is not a de Polignac number, because 64685 - 2⁶ = 64621 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is an unprimeable number.

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, 296 + ... + 465.

It is an arithmetic number, because the mean of its divisors is an integer number (10287).

2⁶⁴⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

64685 is a deficient number, since it is larger than the sum of its proper divisors (17611).

64685 is a wasteful number, since it uses less digits than its factorization.

64685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 783.

The product of its digits is 5760, while the sum is 29.

The square root of 64685 is about 254.3324595878. The cubic root of 64685 is about 40.1422021976.

The spelling of 64685 in words is "sixty-four thousand, six hundred eighty-five".