640241325 has 54 divisors (see below), whose sum is σ = 1169942046. Its totient is φ = 334688640.

The previous prime is 640241321. The next prime is 640241339. The reversal of 640241325 is 523142046.

640241325 is a `hidden beast` number, since 640 + 2 + 4 + 13 + 2 + 5 = 666.

640241325 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 9 ways, for example, as 250810569 + 389430756 = 15837^2 + 19734^2 .

It is not a de Polignac number, because 640241325 - 2² = 640241321 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640241321) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 631519 + ... + 632531.

Almost surely, 2^640241325 is an apocalyptic number.

It is an amenable number.

640241325 is a deficient number, since it is larger than the sum of its proper divisors (529700721).

640241325 is a wasteful number, since it uses less digits than its factorization.

640241325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1135 (or 1074 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 640241325 is about 25302.9904359149. The cubic root of 640241325 is about 861.8821788495.

The spelling of 640241325 in words is "six hundred forty million, two hundred forty-one thousand, three hundred twenty-five".