28689288544 has 96 divisors (see below), whose sum is σ = 65451214080. Its totient is φ = 12124988928.

The previous prime is 28689288541. The next prime is 28689288571. The reversal of 28689288544 is 44588298682.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28689288541) 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, 5486059 + ... + 5491285.

It is an arithmetic number, because the mean of its divisors is an integer number (681783480).

Almost surely, 2^28689288544 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 28689288544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32725607040).

28689288544 is an abundant number, since it is smaller than the sum of its proper divisors (36761925536).

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

28689288544 is a wasteful number, since it uses less digits than its factorization.

28689288544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5580 (or 5572 counting only the distinct ones).

The product of its digits is 70778880, while the sum is 64.

The spelling of 28689288544 in words is "twenty-eight billion, six hundred eighty-nine million, two hundred eighty-eight thousand, five hundred forty-four".