640253005 has 16 divisors (see below), whose sum is σ = 891169920. Its totient is φ = 432476352.

The previous prime is 640252999. The next prime is 640253017. The reversal of 640253005 is 500352046.

640253005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 640253005 - 2¹⁵ = 640220237 is a prime.

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, 134170 + ... + 138859.

It is an arithmetic number, because the mean of its divisors is an integer number (55698120).

Almost surely, 2^640253005 is an apocalyptic number.

It is an amenable number.

640253005 is a deficient number, since it is larger than the sum of its proper divisors (250916915).

640253005 is a wasteful number, since it uses less digits than its factorization.

640253005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273108.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 640253005 is about 25303.2212376211. The cubic root of 640253005 is about 861.8874199580.

The spelling of 640253005 in words is "six hundred forty million, two hundred fifty-three thousand, five".