644001466 has 16 divisors (see below), whose sum is σ = 1017583200. Its totient is φ = 304831728.

The previous prime is 644001451. The next prime is 644001469. The reversal of 644001466 is 664100446.

It is not an unprimeable number, because it can be changed into a prime (644001469) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54636 + ... + 65368.

It is an arithmetic number, because the mean of its divisors is an integer number (63598950).

Almost surely, 2^644001466 is an apocalyptic number.

644001466 is a deficient number, since it is larger than the sum of its proper divisors (373581734).

644001466 is a wasteful number, since it uses less digits than its factorization.

644001466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12333.

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 644001466 is about 25377.1839651290. The cubic root of 644001466 is about 863.5661661222.

The spelling of 644001466 in words is "six hundred forty-four million, one thousand, four hundred sixty-six".