640322880 has 112 divisors (see below), whose sum is σ = 2040477504. Its totient is φ = 170127360.

The previous prime is 640322873. The next prime is 640322909. The reversal of 640322880 is 88223046.

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, 299415 + ... + 301545.

Almost surely, 2^640322880 is an apocalyptic number.

640322880 is a gapful number since it is divisible by the number (60) 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 640322880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1020238752).

640322880 is an abundant number, since it is smaller than the sum of its proper divisors (1400154624).

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

640322880 is a wasteful number, since it uses less digits than its factorization.

640322880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2464 (or 2454 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 33.

The square root of 640322880 is about 25304.6019530045. The cubic root of 640322880 is about 861.9187732887.

The spelling of 640322880 in words is "six hundred forty million, three hundred twenty-two thousand, eight hundred eighty".