640241634 has 8 divisors (see below), whose sum is σ = 1280483280. Its totient is φ = 213413876.

The previous prime is 640241629. The next prime is 640241653. The reversal of 640241634 is 436142046.

640241634 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

640241634 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, 53353464 + ... + 53353475.

It is an arithmetic number, because the mean of its divisors is an integer number (160060410).

Almost surely, 2^640241634 is an apocalyptic number.

640241634 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.

640241634 is a wasteful number, since it uses less digits than its factorization.

640241634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106706944.

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 640241634 is about 25302.9965419118. The cubic root of 640241634 is about 861.8823175064.

The spelling of 640241634 in words is "six hundred forty million, two hundred forty-one thousand, six hundred thirty-four".