640473814 has 8 divisors (see below), whose sum is σ = 966078360. Its totient is φ = 318447696.

The previous prime is 640473791. The next prime is 640473871. The reversal of 640473814 is 418374046.

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

It is a congruent 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, 894159 + ... + 894874.

It is an arithmetic number, because the mean of its divisors is an integer number (120759795).

Almost surely, 2^640473814 is an apocalyptic number.

640473814 is a deficient number, since it is larger than the sum of its proper divisors (325604546).

640473814 is a wasteful number, since it uses less digits than its factorization.

640473814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1789214.

The product of its (nonzero) digits is 64512, while the sum is 37.

The square root of 640473814 is about 25307.5841201803. The cubic root of 640473814 is about 861.9864904941.

The spelling of 640473814 in words is "six hundred forty million, four hundred seventy-three thousand, eight hundred fourteen".