644453562 has 16 divisors (see below), whose sum is σ = 1300733280. Its totient is φ = 212846832.

The previous prime is 644453489. The next prime is 644453587. The reversal of 644453562 is 265354446.

644453562 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 644453562.

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, 492048 + ... + 493355.

It is an arithmetic number, because the mean of its divisors is an integer number (81295830).

Almost surely, 2^644453562 is an apocalyptic number.

644453562 is an abundant number, since it is smaller than the sum of its proper divisors (656279718).

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

644453562 is a wasteful number, since it uses less digits than its factorization.

644453562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 985517.

The product of its digits is 345600, while the sum is 39.

The square root of 644453562 is about 25386.0899312990. The cubic root of 644453562 is about 863.7681964524.

It can be divided in two parts, 6444 and 53562, that added together give a palindrome (60006).

The spelling of 644453562 in words is "six hundred forty-four million, four hundred fifty-three thousand, five hundred sixty-two".