640250285 has 8 divisors (see below), whose sum is σ = 793084416. Its totient is φ = 495677520.

The previous prime is 640250267. The next prime is 640250291. The reversal of 640250285 is 582052046.

640250285 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 640250285 - 2⁸ = 640250029 is a prime.

It is a Duffinian 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, 2065169 + ... + 2065478.

It is an arithmetic number, because the mean of its divisors is an integer number (99135552).

Almost surely, 2^640250285 is an apocalyptic number.

It is an amenable number.

640250285 is a deficient number, since it is larger than the sum of its proper divisors (152834131).

640250285 is a wasteful number, since it uses less digits than its factorization.

640250285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4130683.

The product of its (nonzero) digits is 19200, while the sum is 32.

The square root of 640250285 is about 25303.1674894666. The cubic root of 640250285 is about 861.8861994316.

The spelling of 640250285 in words is "six hundred forty million, two hundred fifty thousand, two hundred eighty-five".