644001014 has 8 divisors (see below), whose sum is σ = 970856400. Its totient is φ = 320382216.

The previous prime is 644000927. The next prime is 644001019. The reversal of 644001014 is 410100446.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644001019) 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, 808649 + ... + 809444.

It is an arithmetic number, because the mean of its divisors is an integer number (121357050).

Almost surely, 2^644001014 is an apocalyptic number.

644001014 is a deficient number, since it is larger than the sum of its proper divisors (326855386).

644001014 is a wasteful number, since it uses less digits than its factorization.

644001014 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1618294.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 644001014 is about 25377.1750594900. The cubic root of 644001014 is about 863.5659640874.

The spelling of 644001014 in words is "six hundred forty-four million, one thousand, fourteen".