28228011520256 has 72 divisors (see below), whose sum is σ = 57662299478784. Its totient is φ = 13784296458240.

The previous prime is 28228011520229. The next prime is 28228011520309. The reversal of 28228011520256 is 65202511082282.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106391921 + ... + 106656911.

Almost surely, 2^{28228011520256} 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 28228011520256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28831149739392).

28228011520256 is an abundant number, since it is smaller than the sum of its proper divisors (29434287958528).

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

28228011520256 is an equidigital number, since it uses as much as digits as its factorization.

28228011520256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274727 (or 274713 counting only the distinct ones).

The product of its (nonzero) digits is 307200, while the sum is 44.

The spelling of 28228011520256 in words is "twenty-eight trillion, two hundred twenty-eight billion, eleven million, five hundred twenty thousand, two hundred fifty-six".