644401354 has 32 divisors (see below), whose sum is σ = 1050990336. Its totient is φ = 295142400.

The previous prime is 644401333. The next prime is 644401367. The reversal of 644401354 is 453104446.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 535954 + ... + 537154.

It is an arithmetic number, because the mean of its divisors is an integer number (32843448).

Almost surely, 2^644401354 is an apocalyptic number.

644401354 is a deficient number, since it is larger than the sum of its proper divisors (406588982).

644401354 is a wasteful number, since it uses less digits than its factorization.

644401354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1630.

The product of its (nonzero) digits is 23040, while the sum is 31.

The square root of 644401354 is about 25385.0616308096. The cubic root of 644401354 is about 863.7448708370.

The spelling of 644401354 in words is "six hundred forty-four million, four hundred one thousand, three hundred fifty-four".