28443323656 has 32 divisors (see below), whose sum is σ = 60185721600. Its totient is φ = 12482962240.

The previous prime is 28443323651. The next prime is 28443323659. The reversal of 28443323656 is 65632334482.

It is not an unprimeable number, because it can be changed into a prime (28443323651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5570200 + ... + 5575303.

It is an arithmetic number, because the mean of its divisors is an integer number (1880803800).

Almost surely, 2^28443323656 is an apocalyptic number.

It is an amenable number.

28443323656 is an abundant number, since it is smaller than the sum of its proper divisors (31742397944).

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

28443323656 is a wasteful number, since it uses less digits than its factorization.

28443323656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11145549 (or 11145545 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 46.

The spelling of 28443323656 in words is "twenty-eight billion, four hundred forty-three million, three hundred twenty-three thousand, six hundred fifty-six".