640576090 has 32 divisors (see below), whose sum is σ = 1437554304. Its totient is φ = 199659840.

The previous prime is 640576081. The next prime is 640576091. The reversal of 640576090 is 90675046.

640576090 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (640576091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 415189 + ... + 416728.

It is an arithmetic number, because the mean of its divisors is an integer number (44923572).

Almost surely, 2^640576090 is an apocalyptic number.

640576090 is an abundant number, since it is smaller than the sum of its proper divisors (796978214).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640576090 is a wasteful number, since it uses less digits than its factorization.

640576090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831942.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 640576090 is about 25309.6046986119. The cubic root of 640576090 is about 862.0323710261.

The spelling of 640576090 in words is "six hundred forty million, five hundred seventy-six thousand, ninety".