640253262 has 32 divisors (see below), whose sum is σ = 1397813760. Its totient is φ = 193891520.

The previous prime is 640253239. The next prime is 640253297. The reversal of 640253262 is 262352046.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 197914 + ... + 201122.

It is an arithmetic number, because the mean of its divisors is an integer number (43681680).

Almost surely, 2^640253262 is an apocalyptic number.

640253262 is an abundant number, since it is smaller than the sum of its proper divisors (757560498).

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

640253262 is a wasteful number, since it uses less digits than its factorization.

640253262 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6248.

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 640253262 is about 25303.2263160254. The cubic root of 640253262 is about 861.8875352796.

The spelling of 640253262 in words is "six hundred forty million, two hundred fifty-three thousand, two hundred sixty-two".