644283930 has 16 divisors (see below), whose sum is σ = 1546281504. Its totient is φ = 171809040.

The previous prime is 644283929. The next prime is 644283967. The reversal of 644283930 is 39382446.

It is an unprimeable number.

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, 10738036 + ... + 10738095.

It is an arithmetic number, because the mean of its divisors is an integer number (96642594).

Almost surely, 2^644283930 is an apocalyptic number.

644283930 is an abundant number, since it is smaller than the sum of its proper divisors (901997574).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

644283930 is a wasteful number, since it uses less digits than its factorization.

644283930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21476141.

The product of its (nonzero) digits is 124416, while the sum is 39.

The square root of 644283930 is about 25382.7486691257. The cubic root of 644283930 is about 863.6924032569.

The spelling of 644283930 in words is "six hundred forty-four million, two hundred eighty-three thousand, nine hundred thirty".