28226723328 has 240 divisors, whose sum is σ = 82934691840. Its totient is φ = 9240956928.

The previous prime is 28226723311. The next prime is 28226723383. The reversal of 28226723328 is 82332762282.

28226723328 is a `hidden beast` number, since 28 + 226 + 72 + 332 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 81344851 + ... + 81345197.

It is an arithmetic number, because the mean of its divisors is an integer number (345561216).

Almost surely, 2^28226723328 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 28226723328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41467345920).

28226723328 is an abundant number, since it is smaller than the sum of its proper divisors (54707968512).

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

28226723328 is a wasteful number, since it uses less digits than its factorization.

28226723328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637 (or 618 counting only the distinct ones).

The product of its digits is 774144, while the sum is 45.

The spelling of 28226723328 in words is "twenty-eight billion, two hundred twenty-six million, seven hundred twenty-three thousand, three hundred twenty-eight".