640368125 has 10 divisors (see below), whose sum is σ = 800204790. Its totient is φ = 512294000.

The previous prime is 640368119. The next prime is 640368151. The reversal of 640368125 is 521863046.

It can be written as a sum of positive squares in 5 ways, for example, as 75307684 + 565060441 = 8678^2 + 23771^2 .

It is not a de Polignac number, because 640368125 - 2¹² = 640364029 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 511670 + ... + 512919.

It is an arithmetic number, because the mean of its divisors is an integer number (80020479).

Almost surely, 2^640368125 is an apocalyptic number.

It is an amenable number.

640368125 is a deficient number, since it is larger than the sum of its proper divisors (159836665).

640368125 is an equidigital number, since it uses as much as digits as its factorization.

640368125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1024609 (or 1024594 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 640368125 is about 25305.4959445572. The cubic root of 640368125 is about 861.9390737744.

The spelling of 640368125 in words is "six hundred forty million, three hundred sixty-eight thousand, one hundred twenty-five".