640799803 has 32 divisors (see below), whose sum is σ = 798336000. Its totient is φ = 512886528.

The previous prime is 640799777. The next prime is 640799807. The reversal of 640799803 is 308997046.

640799803 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 640799803 - 2²⁵ = 607245371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (640799807) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 338283 + ... + 340171.

It is an arithmetic number, because the mean of its divisors is an integer number (24948000).

Almost surely, 2^640799803 is an apocalyptic number.

640799803 is a deficient number, since it is larger than the sum of its proper divisors (157536197).

640799803 is a wasteful number, since it uses less digits than its factorization.

640799803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1976 (or 1962 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 46.

The square root of 640799803 is about 25314.0238405513. The cubic root of 640799803 is about 862.1327106034.

The spelling of 640799803 in words is "six hundred forty million, seven hundred ninety-nine thousand, eight hundred three".