644230032446 has 32 divisors (see below), whose sum is σ = 1297470279168. Its totient is φ = 231691119840.

The previous prime is 644230032373. The next prime is 644230032491.

644230032446 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 160894610 + ... + 160898613.

It is an arithmetic number, because the mean of its divisors is an integer number (40545946224).

Almost surely, 2^644230032446 is an apocalyptic number.

644230032446 is an abundant number, since it is smaller than the sum of its proper divisors (653240246722).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

644230032446 is a wasteful number, since it uses less digits than its factorization.

644230032446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321793256.

The product of its (nonzero) digits is 331776, while the sum is 38.

It can be divided in two parts, 6442300 and 32446, that added together give a palindrome (6474746).

The spelling of 644230032446 in words is "six hundred forty-four billion, two hundred thirty million, thirty-two thousand, four hundred forty-six".