640324400 has 30 divisors (see below), whose sum is σ = 1538380332. Its totient is φ = 256129600.

The previous prime is 640324369. The next prime is 640324417. The reversal of 640324400 is 4423046.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 800006 + ... + 800805.

Almost surely, 2^640324400 is an apocalyptic number.

It is an amenable number.

640324400 is an abundant number, since it is smaller than the sum of its proper divisors (898055932).

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

640324400 is a wasteful number, since it uses less digits than its factorization.

640324400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1600829 (or 1600818 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 640324400 is about 25304.6319870493. The cubic root of 640324400 is about 861.9194552965.

Adding to 640324400 its reverse (4423046), we get a palindrome (644747446).

It can be divided in two parts, 6403 and 24400, that added together give a palindrome (30803).

The spelling of 640324400 in words is "six hundred forty million, three hundred twenty-four thousand, four hundred".