640371125 has 8 divisors (see below), whose sum is σ = 799183320. Its totient is φ = 512296800.

The previous prime is 640371101. The next prime is 640371143. The reversal of 640371125 is 521173046.

640371125 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 4 ways, for example, as 1747684 + 638623441 = 1322^2 + 25271^2 .

It is not a de Polignac number, because 640371125 - 2⁸ = 640370869 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2561360 + ... + 2561609.

It is an arithmetic number, because the mean of its divisors is an integer number (99897915).

Almost surely, 2^640371125 is an apocalyptic number.

It is an amenable number.

640371125 is a deficient number, since it is larger than the sum of its proper divisors (158812195).

640371125 is an equidigital number, since it uses as much as digits as its factorization.

640371125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5122984 (or 5122974 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 640371125 is about 25305.5552201488. Note that the first 3 decimals coincide. The cubic root of 640371125 is about 861.9404197779.

The spelling of 640371125 in words is "six hundred forty million, three hundred seventy-one thousand, one hundred twenty-five".