644701 has 2 divisors, whose sum is σ = 644702. Its totient is φ = 644700.

The previous prime is 644687. The next prime is 644717. The reversal of 644701 is 107446.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 423801 + 220900 = 651^2 + 470^2 .

It is a cyclic number.

It is not a de Polignac number, because 644701 - 2⁵ = 644669 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 644701.

It is not a weakly prime, because it can be changed into another prime (644731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322350 + 322351.

It is an arithmetic number, because the mean of its divisors is an integer number (322351).

2⁶⁴⁴⁷⁰¹ is an apocalyptic number.

It is an amenable number.

644701 is a deficient number, since it is larger than the sum of its proper divisors (1).

644701 is an equidigital number, since it uses as much as digits as its factorization.

644701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 644701 is about 802.9327493632. The cubic root of 644701 is about 86.3878730265.

The spelling of 644701 in words is "six hundred forty-four thousand, seven hundred one".