640200225 has 48 divisors (see below), whose sum is σ = 1212283520. Its totient is φ = 292032000.

The previous prime is 640200221. The next prime is 640200271. The reversal of 640200225 is 522002046.

It is not a de Polignac number, because 640200225 - 2² = 640200221 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (640200221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 314511 + ... + 316539.

Almost surely, 2^640200225 is an apocalyptic number.

It is an amenable number.

640200225 is a deficient number, since it is larger than the sum of its proper divisors (572083295).

640200225 is a wasteful number, since it uses less digits than its factorization.

640200225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2650 (or 2645 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 640200225 is about 25302.1782659122. The cubic root of 640200225 is about 861.8637357437.

The spelling of 640200225 in words is "six hundred forty million, two hundred thousand, two hundred twenty-five".