28247688 has 96 divisors (see below), whose sum is σ = 89631360. Its totient is φ = 7868160.

The previous prime is 28247683. The next prime is 28247707. The reversal of 28247688 is 88674282.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (28247683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19981 + ... + 21347.

It is an arithmetic number, because the mean of its divisors is an integer number (933660).

Almost surely, 2^28247688 is an apocalyptic number.

28247688 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28247688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44815680).

28247688 is an abundant number, since it is smaller than the sum of its proper divisors (61383672).

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

28247688 is a wasteful number, since it uses less digits than its factorization.

28247688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1427 (or 1420 counting only the distinct ones).

The product of its digits is 344064, while the sum is 45.

The square root of 28247688 is about 5314.8554072524. The cubic root of 28247688 is about 304.5516587515.

The spelling of 28247688 in words is "twenty-eight million, two hundred forty-seven thousand, six hundred eighty-eight".