640561200 has 60 divisors (see below), whose sum is σ = 2051934888. Its totient is φ = 170816000.

The previous prime is 640561189. The next prime is 640561211. The reversal of 640561200 is 2165046.

It is an interprime number because it is at equal distance from previous prime (640561189) and next prime (640561211).

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 265701 + ... + 268100.

Almost surely, 2^640561200 is an apocalyptic number.

640561200 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

640561200 is an abundant number, since it is smaller than the sum of its proper divisors (1411373688).

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

640561200 is a wasteful number, since it uses less digits than its factorization.

640561200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533822 (or 533811 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 640561200 is about 25309.3105397994. The cubic root of 640561200 is about 862.0256917460.

It can be divided in two parts, 64056 and 1200, that added together give a palindrome (65256).

The spelling of 640561200 in words is "six hundred forty million, five hundred sixty-one thousand, two hundred".