644882001 has 8 divisors (see below), whose sum is σ = 863269344. Its totient is φ = 428208000.

The previous prime is 644881999. The next prime is 644882003. The reversal of 644882001 is 100288446.

It is an interprime number because it is at equal distance from previous prime (644881999) and next prime (644882003).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 644882001 - 2¹ = 644881999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (644882003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 427456 + ... + 428961.

It is an arithmetic number, because the mean of its divisors is an integer number (107908668).

Almost surely, 2^644882001 is an apocalyptic number.

It is an amenable number.

644882001 is a deficient number, since it is larger than the sum of its proper divisors (218387343).

644882001 is a wasteful number, since it uses less digits than its factorization.

644882001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 856671.

The product of its (nonzero) digits is 12288, while the sum is 33.

The square root of 644882001 is about 25394.5269890975. The cubic root of 644882001 is about 863.9595678846.

The spelling of 644882001 in words is "six hundred forty-four million, eight hundred eighty-two thousand, one".