64645836 has 12 divisors (see below), whose sum is σ = 150840312. Its totient is φ = 21548608.

The previous prime is 64645793. The next prime is 64645837. The reversal of 64645836 is 63854646.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×64645836² = 8358168224277792, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64645837) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2693565 + ... + 2693588.

It is an arithmetic number, because the mean of its divisors is an integer number (12570026).

Almost surely, 2^64645836 is an apocalyptic number.

It is an amenable number.

64645836 is an abundant number, since it is smaller than the sum of its proper divisors (86194476).

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

64645836 is a wasteful number, since it uses less digits than its factorization.

64645836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5387160 (or 5387158 counting only the distinct ones).

The product of its digits is 414720, while the sum is 42.

The square root of 64645836 is about 8040.2634285202. The cubic root of 64645836 is about 401.3409910007.

The spelling of 64645836 in words is "sixty-four million, six hundred forty-five thousand, eight hundred thirty-six".