640253254 has 32 divisors (see below), whose sum is σ = 1038640320. Its totient is φ = 295206912.

The previous prime is 640253239. The next prime is 640253297. The reversal of 640253254 is 452352046.

640253254 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 190662 + ... + 193990.

It is an arithmetic number, because the mean of its divisors is an integer number (32457510).

Almost surely, 2^640253254 is an apocalyptic number.

640253254 is a deficient number, since it is larger than the sum of its proper divisors (398387066).

640253254 is a wasteful number, since it uses less digits than its factorization.

640253254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3504.

The product of its (nonzero) digits is 28800, while the sum is 31.

The square root of 640253254 is about 25303.2261579428. The cubic root of 640253254 is about 861.8875316898.

The spelling of 640253254 in words is "six hundred forty million, two hundred fifty-three thousand, two hundred fifty-four".