640203025 has 24 divisors (see below), whose sum is σ = 989740224. Its totient is φ = 399086400.

The previous prime is 640203013. The next prime is 640203037. The reversal of 640203025 is 520302046.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (640203013) and next prime (640203037).

It is not a de Polignac number, because 640203025 - 2¹⁵ = 640170257 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 640202987 and 640203005.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 164362 + ... + 168211.

It is an arithmetic number, because the mean of its divisors is an integer number (41239176).

Almost surely, 2^640203025 is an apocalyptic number.

It is an amenable number.

640203025 is a deficient number, since it is larger than the sum of its proper divisors (349537199).

640203025 is a wasteful number, since it uses less digits than its factorization.

640203025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332601 (or 332596 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 640203025 is about 25302.2335970562. The cubic root of 640203025 is about 861.8649922334.

The spelling of 640203025 in words is "six hundred forty million, two hundred three thousand, twenty-five".