641723320 has 128 divisors (see below), whose sum is σ = 1699891200. Its totient is φ = 213497856.

The previous prime is 641723297. The next prime is 641723351. The reversal of 641723320 is 23327146.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 1481824 + ... + 1482256.

It is an arithmetic number, because the mean of its divisors is an integer number (13280400).

Almost surely, 2^641723320 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 641723320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (849945600).

641723320 is an abundant number, since it is smaller than the sum of its proper divisors (1058167880).

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

641723320 is a wasteful number, since it uses less digits than its factorization.

641723320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 597 (or 593 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 28.

The square root of 641723320 is about 25332.2584859700. The cubic root of 641723320 is about 862.5466787031.

The spelling of 641723320 in words is "six hundred forty-one million, seven hundred twenty-three thousand, three hundred twenty".