644499282 has 32 divisors (see below), whose sum is σ = 1497297024. Its totient is φ = 181123200.

The previous prime is 644499253. The next prime is 644499319. The reversal of 644499282 is 282994446.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123219 + ... + 128342.

It is an arithmetic number, because the mean of its divisors is an integer number (46790532).

Almost surely, 2^644499282 is an apocalyptic number.

644499282 is an abundant number, since it is smaller than the sum of its proper divisors (852797742).

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

644499282 is a wasteful number, since it uses less digits than its factorization.

644499282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251634.

The product of its digits is 995328, while the sum is 48.

The square root of 644499282 is about 25386.9904084750. The cubic root of 644499282 is about 863.7886223090.

The spelling of 644499282 in words is "six hundred forty-four million, four hundred ninety-nine thousand, two hundred eighty-two".