640090244 has 12 divisors (see below), whose sum is σ = 1120488768. Its totient is φ = 319950600.

The previous prime is 640090229. The next prime is 640090261. The reversal of 640090244 is 442090046.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7112 + ... + 36479.

It is an arithmetic number, because the mean of its divisors is an integer number (93374064).

Almost surely, 2^640090244 is an apocalyptic number.

It is an amenable number.

640090244 is a deficient number, since it is larger than the sum of its proper divisors (480398524).

640090244 is a wasteful number, since it uses less digits than its factorization.

640090244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47266 (or 47264 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 640090244 is about 25300.0048221339. The cubic root of 640090244 is about 861.8143792766.

The spelling of 640090244 in words is "six hundred forty million, ninety thousand, two hundred forty-four".