28223068720 has 160 divisors (see below), whose sum is σ = 81920471040. Its totient is φ = 8784952320.

The previous prime is 28223068651. The next prime is 28223068739. The reversal of 28223068720 is 2786032282.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5313426 + ... + 5318734.

It is an arithmetic number, because the mean of its divisors is an integer number (512002944).

Almost surely, 2^28223068720 is an apocalyptic number.

28223068720 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 28223068720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40960235520).

28223068720 is an abundant number, since it is smaller than the sum of its proper divisors (53697402320).

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

28223068720 is a wasteful number, since it uses less digits than its factorization.

28223068720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6203 (or 6197 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 40.

The spelling of 28223068720 in words is "twenty-eight billion, two hundred twenty-three million, sixty-eight thousand, seven hundred twenty".