644263112 has 16 divisors (see below), whose sum is σ = 1209321600. Its totient is φ = 321777360.

The previous prime is 644263073. The next prime is 644263117. The reversal of 644263112 is 211362446.

It is not an unprimeable number, because it can be changed into a prime (644263117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36464 + ... + 51167.

It is an arithmetic number, because the mean of its divisors is an integer number (75582600).

Almost surely, 2^644263112 is an apocalyptic number.

It is an amenable number.

644263112 is a deficient number, since it is larger than the sum of its proper divisors (565058488).

644263112 is a wasteful number, since it uses less digits than its factorization.

644263112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88556 (or 88552 counting only the distinct ones).

The product of its digits is 6912, while the sum is 29.

The square root of 644263112 is about 25382.3385841415. The cubic root of 644263112 is about 863.6831006595.

The spelling of 644263112 in words is "six hundred forty-four million, two hundred sixty-three thousand, one hundred twelve".