640298304 has 112 divisors (see below), whose sum is σ = 1943242240. Its totient is φ = 206530560.

The previous prime is 640298299. The next prime is 640298327. The reversal of 640298304 is 403892046.

It is a happy number.

640298304 is a `hidden beast` number, since 64 + 0 + 298 + 304 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47592 + ... + 59544.

Almost surely, 2^640298304 is an apocalyptic number.

640298304 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640298304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (971621120).

640298304 is an abundant number, since it is smaller than the sum of its proper divisors (1302943936).

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

640298304 is a wasteful number, since it uses less digits than its factorization.

640298304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12005 (or 11989 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 640298304 is about 25304.1163449744. The cubic root of 640298304 is about 861.9077461505.

The spelling of 640298304 in words is "six hundred forty million, two hundred ninety-eight thousand, three hundred four".