643828225560 has 128 divisors (see below), whose sum is σ = 2083536000000. Its totient is φ = 158215988736.

The previous prime is 643828225519. The next prime is 643828225589. The reversal of 643828225560 is 65522828346.

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, 589941 + ... + 1278939.

It is an arithmetic number, because the mean of its divisors is an integer number (16277625000).

Almost surely, 2^643828225560 is an apocalyptic number.

643828225560 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 643828225560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1041768000000).

643828225560 is an abundant number, since it is smaller than the sum of its proper divisors (1439707774440).

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

643828225560 is a wasteful number, since it uses less digits than its factorization.

643828225560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689625 (or 689621 counting only the distinct ones).

The product of its (nonzero) digits is 5529600, while the sum is 51.

The spelling of 643828225560 in words is "six hundred forty-three billion, eight hundred twenty-eight million, two hundred twenty-five thousand, five hundred sixty".