640794308 has 24 divisors (see below), whose sum is σ = 1398097344. Its totient is φ = 249660000.

The previous prime is 640794293. The next prime is 640794313. The reversal of 640794308 is 803497046.

640794308 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1039943 + ... + 1040558.

It is an arithmetic number, because the mean of its divisors is an integer number (58254056).

Almost surely, 2^640794308 is an apocalyptic number.

It is an amenable number.

640794308 is an abundant number, since it is smaller than the sum of its proper divisors (757303036).

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

640794308 is a wasteful number, since it uses less digits than its factorization.

640794308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2080523 (or 2080521 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 640794308 is about 25313.9153036428. The cubic root of 640794308 is about 862.1302462701.

The spelling of 640794308 in words is "six hundred forty million, seven hundred ninety-four thousand, three hundred eight".