640845714 has 8 divisors (see below), whose sum is σ = 1281691440. Its totient is φ = 213615236.

The previous prime is 640845701. The next prime is 640845721. The reversal of 640845714 is 417548046.

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

640845714 is an admirable number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53403804 + ... + 53403815.

It is an arithmetic number, because the mean of its divisors is an integer number (160211430).

Almost surely, 2^640845714 is an apocalyptic number.

640845714 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.

640845714 is a wasteful number, since it uses less digits than its factorization.

640845714 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106807624.

The product of its (nonzero) digits is 107520, while the sum is 39.

The square root of 640845714 is about 25314.9306536676. The cubic root of 640845714 is about 862.1532996805.

The spelling of 640845714 in words is "six hundred forty million, eight hundred forty-five thousand, seven hundred fourteen".