644031466 has 16 divisors (see below), whose sum is σ = 1040949504. Its totient is φ = 297076464.

The previous prime is 644031413. The next prime is 644031481. The reversal of 644031466 is 664130446.

644031466 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47635 + ... + 59641.

It is an arithmetic number, because the mean of its divisors is an integer number (65059344).

Almost surely, 2^644031466 is an apocalyptic number.

644031466 is a deficient number, since it is larger than the sum of its proper divisors (396918038).

644031466 is a wasteful number, since it uses less digits than its factorization.

644031466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14085.

The product of its (nonzero) digits is 41472, while the sum is 34.

The square root of 644031466 is about 25377.7750403774. The cubic root of 644031466 is about 863.5795752959.

The spelling of 644031466 in words is "six hundred forty-four million, thirty-one thousand, four hundred sixty-six".