640044354 has 8 divisors (see below), whose sum is σ = 1280088720. Its totient is φ = 213348116.

The previous prime is 640044347. The next prime is 640044397. The reversal of 640044354 is 453440046.

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

640044354 is an admirable number.

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, 53337024 + ... + 53337035.

It is an arithmetic number, because the mean of its divisors is an integer number (160011090).

Almost surely, 2^640044354 is an apocalyptic number.

640044354 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

640044354 is a wasteful number, since it uses less digits than its factorization.

640044354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106674064.

The product of its (nonzero) digits is 23040, while the sum is 30.

The square root of 640044354 is about 25299.0978890553. The cubic root of 640044354 is about 861.7937834271.

The spelling of 640044354 in words is "six hundred forty million, forty-four thousand, three hundred fifty-four".