644294294 has 32 divisors (see below), whose sum is σ = 1173553920. Its totient is φ = 259136928.

The previous prime is 644294281. The next prime is 644294303. The reversal of 644294294 is 492492446.

644294294 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

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, 17144 + ... + 39780.

It is an arithmetic number, because the mean of its divisors is an integer number (36673560).

Almost surely, 2^644294294 is an apocalyptic number.

644294294 is a deficient number, since it is larger than the sum of its proper divisors (529259626).

644294294 is a wasteful number, since it uses less digits than its factorization.

644294294 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22772.

The product of its digits is 497664, while the sum is 44.

The square root of 644294294 is about 25382.9528227115. The cubic root of 644294294 is about 863.6970343725.

The spelling of 644294294 in words is "six hundred forty-four million, two hundred ninety-four thousand, two hundred ninety-four".