640200500 has 24 divisors (see below), whose sum is σ = 1398198984. Its totient is φ = 256080000.

The previous prime is 640200487. The next prime is 640200511. The reversal of 640200500 is 5002046.

It can be written as a sum of positive squares in 4 ways, for example, as 87198244 + 553002256 = 9338^2 + 23516^2 .

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, 639701 + ... + 640700.

It is an arithmetic number, because the mean of its divisors is an integer number (58258291).

Almost surely, 2^640200500 is an apocalyptic number.

It is an amenable number.

640200500 is an abundant number, since it is smaller than the sum of its proper divisors (757998484).

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

640200500 is a wasteful number, since it uses less digits than its factorization.

640200500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280420 (or 1280408 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 640200500 is about 25302.1837002264. The cubic root of 640200500 is about 861.8638591491.

Adding to 640200500 its reverse (5002046), we get a palindrome (645202546).

The spelling of 640200500 in words is "six hundred forty million, two hundred thousand, five hundred".