28155497648 has 80 divisors (see below), whose sum is σ = 58449250080. Its totient is φ = 13092323328.

The previous prime is 28155497647. The next prime is 28155497659. The reversal of 28155497648 is 84679455182.

It is not an unprimeable number, because it can be changed into a prime (28155497647) 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, 11647736 + ... + 11650152.

It is an arithmetic number, because the mean of its divisors is an integer number (730615626).

Almost surely, 2^28155497648 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 28155497648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29224625040).

28155497648 is an abundant number, since it is smaller than the sum of its proper divisors (30293752432).

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

28155497648 is a wasteful number, since it uses less digits than its factorization.

28155497648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2934 (or 2928 counting only the distinct ones).

The product of its digits is 19353600, while the sum is 59.

The spelling of 28155497648 in words is "twenty-eight billion, one hundred fifty-five million, four hundred ninety-seven thousand, six hundred forty-eight".