28557443320 has 64 divisors (see below), whose sum is σ = 73536076800. Its totient is φ = 9777436800.

The previous prime is 28557443303. The next prime is 28557443329. The reversal of 28557443320 is 2334475582.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28557443329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130395 + ... + 272245.

It is an arithmetic number, because the mean of its divisors is an integer number (1149001200).

Almost surely, 2^28557443320 is an apocalyptic number.

28557443320 is a gapful number since it is divisible by the number (20) 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 28557443320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36768038400).

28557443320 is an abundant number, since it is smaller than the sum of its proper divisors (44978633480).

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

28557443320 is a wasteful number, since it uses less digits than its factorization.

28557443320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142588 (or 142584 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 43.

The spelling of 28557443320 in words is "twenty-eight billion, five hundred fifty-seven million, four hundred forty-three thousand, three hundred twenty".