64644055 has 16 divisors (see below), whose sum is σ = 89872704. Its totient is φ = 43718400.

The previous prime is 64644049. The next prime is 64644059. The reversal of 64644055 is 55044646.

It is not a de Polignac number, because 64644055 - 2⁷ = 64643927 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64644055.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64644059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10096 + ... + 15205.

It is an arithmetic number, because the mean of its divisors is an integer number (5617044).

Almost surely, 2^64644055 is an apocalyptic number.

64644055 is a deficient number, since it is larger than the sum of its proper divisors (25228649).

64644055 is a wasteful number, since it uses less digits than its factorization.

64644055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25386.

The product of its (nonzero) digits is 57600, while the sum is 34.

The square root of 64644055 is about 8040.1526726798. The cubic root of 64644055 is about 401.3373053038.

The spelling of 64644055 in words is "sixty-four million, six hundred forty-four thousand, fifty-five".