28447721448 has 64 divisors (see below), whose sum is σ = 73602432000. Its totient is φ = 9151763712.

The previous prime is 28447721389. The next prime is 28447721459. The reversal of 28447721448 is 84412774482.

It is a self number, because there is not a number n which added to its sum of digits gives 28447721448.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1996686 + ... + 2010882.

It is an arithmetic number, because the mean of its divisors is an integer number (1150038000).

Almost surely, 2^28447721448 is an apocalyptic number.

It is an amenable number.

28447721448 is an abundant number, since it is smaller than the sum of its proper divisors (45154710552).

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

28447721448 is a wasteful number, since it uses less digits than its factorization.

28447721448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17114 (or 17110 counting only the distinct ones).

The product of its digits is 3211264, while the sum is 51.

The spelling of 28447721448 in words is "twenty-eight billion, four hundred forty-seven million, seven hundred twenty-one thousand, four hundred forty-eight".