644360115 has 32 divisors (see below), whose sum is σ = 1179210240. Its totient is φ = 294326784.

The previous prime is 644360081. The next prime is 644360131. The reversal of 644360115 is 511063446.

644360115 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 644360115 - 2⁶ = 644360051 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 252516 + ... + 255054.

It is an arithmetic number, because the mean of its divisors is an integer number (36850320).

Almost surely, 2^644360115 is an apocalyptic number.

644360115 is a deficient number, since it is larger than the sum of its proper divisors (534850125).

644360115 is a wasteful number, since it uses less digits than its factorization.

644360115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4971.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 644360115 is about 25384.2493487596. The cubic root of 644360115 is about 863.7264450871.

The spelling of 644360115 in words is "six hundred forty-four million, three hundred sixty thousand, one hundred fifteen".