28115456 has 40 divisors (see below), whose sum is σ = 56899260. Its totient is φ = 13877248.

The previous prime is 28115443. The next prime is 28115473. The reversal of 28115456 is 65451182.

It can be written as a sum of positive squares in 2 ways, for example, as 22278400 + 5837056 = 4720^2 + 2416^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45260 + ... + 45876.

Almost surely, 2^28115456 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 28115456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28449630).

28115456 is an abundant number, since it is smaller than the sum of its proper divisors (28783804).

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

28115456 is an frugal number, since it uses more digits than its factorization.

28115456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724 (or 708 counting only the distinct ones).

The product of its digits is 9600, while the sum is 32.

The square root of 28115456 is about 5302.4009656004. The cubic root of 28115456 is about 304.0756967546.

The spelling of 28115456 in words is "twenty-eight million, one hundred fifteen thousand, four hundred fifty-six".