644070370 has 16 divisors (see below), whose sum is σ = 1159682688. Its totient is φ = 257549040.

The previous prime is 644070337. The next prime is 644070377. The reversal of 644070370 is 73070446.

It is not an unprimeable number, because it can be changed into a prime (644070377) 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 7 ways as a sum of consecutive naturals, for example, 33277 + ... + 48943.

It is an arithmetic number, because the mean of its divisors is an integer number (72480168).

Almost surely, 2^644070370 is an apocalyptic number.

644070370 is a deficient number, since it is larger than the sum of its proper divisors (515612318).

644070370 is a wasteful number, since it uses less digits than its factorization.

644070370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19785.

The product of its (nonzero) digits is 14112, while the sum is 31.

The square root of 644070370 is about 25378.5415262580. The cubic root of 644070370 is about 863.5969636924.

The spelling of 644070370 in words is "six hundred forty-four million, seventy thousand, three hundred seventy".