640325299680 has 384 divisors, whose sum is σ = 2457713664000. Its totient is φ = 154415462400.

The previous prime is 640325299673. The next prime is 640325299681. The reversal of 640325299680 is 86992523046.

It is a happy number.

640325299680 is a `hidden beast` number, since 6 + 4 + 0 + 32 + 529 + 9 + 6 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640325299681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9041046 + ... + 9111594.

It is an arithmetic number, because the mean of its divisors is an integer number (6400296000).

Almost surely, 2^640325299680 is an apocalyptic number.

640325299680 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 640325299680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1228856832000).

640325299680 is an abundant number, since it is smaller than the sum of its proper divisors (1817388364320).

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

640325299680 is a wasteful number, since it uses less digits than its factorization.

640325299680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70775 (or 70761 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 54.

The spelling of 640325299680 in words is "six hundred forty billion, three hundred twenty-five million, two hundred ninety-nine thousand, six hundred eighty".