644304274 has 8 divisors (see below), whose sum is σ = 974066688. Its totient is φ = 319615380.

The previous prime is 644304259. The next prime is 644304289. The reversal of 644304274 is 472403446.

644304274 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (644304259) and next prime (644304289).

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1268062 + ... + 1268569.

It is an arithmetic number, because the mean of its divisors is an integer number (121758336).

Almost surely, 2^644304274 is an apocalyptic number.

644304274 is a deficient number, since it is larger than the sum of its proper divisors (329762414).

644304274 is a wasteful number, since it uses less digits than its factorization.

644304274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2536760.

The product of its (nonzero) digits is 64512, while the sum is 34.

The square root of 644304274 is about 25383.1494105834. The cubic root of 644304274 is about 863.7014938522.

The spelling of 644304274 in words is "six hundred forty-four million, three hundred four thousand, two hundred seventy-four".