640366284 has 48 divisors (see below), whose sum is σ = 1548529920. Its totient is φ = 205719360.

The previous prime is 640366261. The next prime is 640366297. The reversal of 640366284 is 482663046.

640366284 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 15 ways as a sum of consecutive naturals, for example, 239137 + ... + 241799.

It is an arithmetic number, because the mean of its divisors is an integer number (32261040).

Almost surely, 2^640366284 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640366284, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (774264960).

640366284 is an abundant number, since it is smaller than the sum of its proper divisors (908163636).

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

640366284 is a wasteful number, since it uses less digits than its factorization.

640366284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3390 (or 3388 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 39.

The square root of 640366284 is about 25305.4595690337. The cubic root of 640366284 is about 861.9382477749.

The spelling of 640366284 in words is "six hundred forty million, three hundred sixty-six thousand, two hundred eighty-four".