644054452 has 24 divisors (see below), whose sum is σ = 1208511360. Its totient is φ = 299245440.

The previous prime is 644054447. The next prime is 644054459. The reversal of 644054452 is 254450446.

It is a super-2 number, since 2×644054452² = 829612274282040608, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644054459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54574 + ... + 65317.

It is an arithmetic number, because the mean of its divisors is an integer number (50354640).

Almost surely, 2^644054452 is an apocalyptic number.

It is an amenable number.

644054452 is a deficient number, since it is larger than the sum of its proper divisors (564456908).

644054452 is a wasteful number, since it uses less digits than its factorization.

644054452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119991 (or 119989 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 34.

The square root of 644054452 is about 25378.2279129178. The cubic root of 644054452 is about 863.5898491231.

The spelling of 644054452 in words is "six hundred forty-four million, fifty-four thousand, four hundred fifty-two".