644295255 has 16 divisors (see below), whose sum is σ = 1031995104. Its totient is φ = 343249920.

The previous prime is 644295241. The next prime is 644295259. The reversal of 644295255 is 552592446.

It is not a de Polignac number, because 644295255 - 2⁶ = 644295191 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644295259) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8866 + ... + 36975.

It is an arithmetic number, because the mean of its divisors is an integer number (64499694).

Almost surely, 2^644295255 is an apocalyptic number.

644295255 is a deficient number, since it is larger than the sum of its proper divisors (387699849).

644295255 is a wasteful number, since it uses less digits than its factorization.

644295255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46786.

The product of its digits is 432000, while the sum is 42.

The square root of 644295255 is about 25382.9717527322. The cubic root of 644295255 is about 863.6974637894.

The spelling of 644295255 in words is "six hundred forty-four million, two hundred ninety-five thousand, two hundred fifty-five".