644199322 has 16 divisors (see below), whose sum is σ = 1043062272. Its totient is φ = 296627760.

The previous prime is 644199287. The next prime is 644199331. The reversal of 644199322 is 223991446.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17538 + ... + 39949.

It is an arithmetic number, because the mean of its divisors is an integer number (65191392).

Almost surely, 2^644199322 is an apocalyptic number.

644199322 is a deficient number, since it is larger than the sum of its proper divisors (398862950).

644199322 is a wasteful number, since it uses less digits than its factorization.

644199322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57933.

The product of its digits is 93312, while the sum is 40.

The square root of 644199322 is about 25381.0819706332. The cubic root of 644199322 is about 863.6545946230.

The spelling of 644199322 in words is "six hundred forty-four million, one hundred ninety-nine thousand, three hundred twenty-two".