644053059 has 16 divisors (see below), whose sum is σ = 1027549600. Its totient is φ = 396340128.

The previous prime is 644053049. The next prime is 644053099. The reversal of 644053059 is 950350446.

It is a happy number.

644053059 is a `hidden beast` number, since 644 + 0 + 5 + 3 + 0 + 5 + 9 = 666.

It is not a de Polignac number, because 644053059 - 2²⁵ = 610498627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (644053049) 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, 917104 + ... + 917805.

It is an arithmetic number, because the mean of its divisors is an integer number (64221850).

Almost surely, 2^644053059 is an apocalyptic number.

644053059 is a deficient number, since it is larger than the sum of its proper divisors (383496541).

644053059 is a wasteful number, since it uses less digits than its factorization.

644053059 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1834931 (or 1834925 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 644053059 is about 25378.2004681183. The cubic root of 644053059 is about 863.5892265145.

The spelling of 644053059 in words is "six hundred forty-four million, fifty-three thousand, fifty-nine".