644597112 has 16 divisors (see below), whose sum is σ = 1611492840. Its totient is φ = 214865696.

The previous prime is 644597111. The next prime is 644597113. The reversal of 644597112 is 211795446.

It is an interprime number because it is at equal distance from previous prime (644597111) and next prime (644597113).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644597111) 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, 13429083 + ... + 13429130.

Almost surely, 2^644597112 is an apocalyptic number.

It is an amenable number.

644597112 is an abundant number, since it is smaller than the sum of its proper divisors (966895728).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

644597112 is a wasteful number, since it uses less digits than its factorization.

644597112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26858222 (or 26858218 counting only the distinct ones).

The product of its digits is 60480, while the sum is 39.

The square root of 644597112 is about 25388.9171096366. The cubic root of 644597112 is about 863.8323255724.

The spelling of 644597112 in words is "six hundred forty-four million, five hundred ninety-seven thousand, one hundred twelve".