64185856 has 40 divisors (see below), whose sum is σ = 146575440. Its totient is φ = 27506688.

The previous prime is 64185833. The next prime is 64185859. The reversal of 64185856 is 65858146.

It is a super-2 number, since 2×64185856² = 8239648220905472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64185859) 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 3 ways as a sum of consecutive naturals, for example, 5371 + ... + 12538.

It is an arithmetic number, because the mean of its divisors is an integer number (3664386).

Almost surely, 2^64185856 is an apocalyptic number.

It is an amenable number.

64185856 is an abundant number, since it is smaller than the sum of its proper divisors (82389584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64185856 is an equidigital number, since it uses as much as digits as its factorization.

64185856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17934 (or 17918 counting only the distinct ones).

The product of its digits is 230400, while the sum is 43.

The square root of 64185856 is about 8011.6075790068. The cubic root of 64185856 is about 400.3868257939.

The spelling of 64185856 in words is "sixty-four million, one hundred eighty-five thousand, eight hundred fifty-six".