644353454 has 16 divisors (see below), whose sum is σ = 971902800. Its totient is φ = 320390784.

The previous prime is 644353433. The next prime is 644353469. The reversal of 644353454 is 454353446.

It is a congruent number.

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, 542249 + ... + 543435.

It is an arithmetic number, because the mean of its divisors is an integer number (60743925).

Almost surely, 2^644353454 is an apocalyptic number.

644353454 is a deficient number, since it is larger than the sum of its proper divisors (327549346).

644353454 is a wasteful number, since it uses less digits than its factorization.

644353454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2467.

The product of its digits is 345600, while the sum is 38.

The square root of 644353454 is about 25384.1181450134. The cubic root of 644353454 is about 863.7234688519.

The spelling of 644353454 in words is "six hundred forty-four million, three hundred fifty-three thousand, four hundred fifty-four".