644505484 has 12 divisors (see below), whose sum is σ = 1289011024. Its totient is φ = 276216624.

The previous prime is 644505481. The next prime is 644505487. The reversal of 644505484 is 484505446.

It is an interprime number because it is at equal distance from previous prime (644505481) and next prime (644505487).

644505484 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (644505481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11508999 + ... + 11509054.

Almost surely, 2^644505484 is an apocalyptic number.

It is an amenable number.

644505484 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

644505484 is a wasteful number, since it uses less digits than its factorization.

644505484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23018064 (or 23018062 counting only the distinct ones).

The product of its (nonzero) digits is 307200, while the sum is 40.

The square root of 644505484 is about 25387.1125573587. The cubic root of 644505484 is about 863.7913930387.

The spelling of 644505484 in words is "six hundred forty-four million, five hundred five thousand, four hundred eighty-four".