644325701 has 16 divisors (see below), whose sum is σ = 702024960. Its totient is φ = 589317120.

The previous prime is 644325697. The next prime is 644325709. The reversal of 644325701 is 107523446.

It is a cyclic number.

It is not a de Polignac number, because 644325701 - 2² = 644325697 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644325709) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71300 + ... + 79826.

It is an arithmetic number, because the mean of its divisors is an integer number (43876560).

Almost surely, 2^644325701 is an apocalyptic number.

It is an amenable number.

644325701 is a deficient number, since it is larger than the sum of its proper divisors (57699259).

644325701 is a wasteful number, since it uses less digits than its factorization.

644325701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8684.

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 644325701 is about 25383.5714784189. The cubic root of 644325701 is about 863.7110681726.

The spelling of 644325701 in words is "six hundred forty-four million, three hundred twenty-five thousand, seven hundred one".