644034370 has 32 divisors (see below), whose sum is σ = 1331624448. Its totient is φ = 219686208.

The previous prime is 644034361. The next prime is 644034371. The reversal of 644034370 is 73430446.

It is not an unprimeable number, because it can be changed into a prime (644034371) 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, 9562 + ... + 37141.

It is an arithmetic number, because the mean of its divisors is an integer number (41613264).

Almost surely, 2^644034370 is an apocalyptic number.

644034370 is an abundant number, since it is smaller than the sum of its proper divisors (687590078).

644034370 is a wasteful number, since it uses less digits than its factorization.

644034370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46914.

The product of its (nonzero) digits is 24192, while the sum is 31.

The square root of 644034370 is about 25377.8322557306. The cubic root of 644034370 is about 863.5808732819.

The spelling of 644034370 in words is "six hundred forty-four million, thirty-four thousand, three hundred seventy".