644034850 has 24 divisors (see below), whose sum is σ = 1199722320. Its totient is φ = 257223120.

The previous prime is 644034841. The next prime is 644034869. The reversal of 644034850 is 58430446.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24721 + ... + 43579.

It is an arithmetic number, because the mean of its divisors is an integer number (49988430).

Almost surely, 2^644034850 is an apocalyptic number.

644034850 is a deficient number, since it is larger than the sum of its proper divisors (555687470).

644034850 is a wasteful number, since it uses less digits than its factorization.

644034850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19554 (or 19549 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 34.

The square root of 644034850 is about 25377.8417128013. The cubic root of 644034850 is about 863.5810878246.

The spelling of 644034850 in words is "six hundred forty-four million, thirty-four thousand, eight hundred fifty".