28228011520220 has 48 divisors (see below), whose sum is σ = 59995406878848. Its totient is φ = 11154723462720.

The previous prime is 28228011520217. The next prime is 28228011520229. The reversal of 28228011520220 is 2202511082282.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28228011520229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43212635 + ... + 43861005.

It is an arithmetic number, because the mean of its divisors is an integer number (1249904309976).

Almost surely, 2^{28228011520220} is an apocalyptic number.

28228011520220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28228011520220 is an abundant number, since it is smaller than the sum of its proper divisors (31767395358628).

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

28228011520220 is a wasteful number, since it uses less digits than its factorization.

28228011520220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674690 (or 674688 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 35.

The spelling of 28228011520220 in words is "twenty-eight trillion, two hundred twenty-eight billion, eleven million, five hundred twenty thousand, two hundred twenty".