64444865 has 8 divisors (see below), whose sum is σ = 81404160. Its totient is φ = 48842352.

The previous prime is 64444859. The next prime is 64444867. The reversal of 64444865 is 56844446.

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

It is a cyclic number.

It is not a de Polignac number, because 64444865 - 2⁶ = 64444801 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64444867) 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, 339089 + ... + 339278.

It is an arithmetic number, because the mean of its divisors is an integer number (10175520).

Almost surely, 2^64444865 is an apocalyptic number.

It is an amenable number.

64444865 is a deficient number, since it is larger than the sum of its proper divisors (16959295).

64444865 is a wasteful number, since it uses less digits than its factorization.

64444865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678391.

The product of its digits is 368640, while the sum is 41.

The square root of 64444865 is about 8027.7559130806. The cubic root of 64444865 is about 400.9246629324.

The spelling of 64444865 in words is "sixty-four million, four hundred forty-four thousand, eight hundred sixty-five".