28687248 has 60 divisors (see below), whose sum is σ = 81414060. Its totient is φ = 9427968.

The previous prime is 28687231. The next prime is 28687271. The reversal of 28687248 is 84278682.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 23155344 + 5531904 = 4812^2 + 2352^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9148 + ... + 11876.

It is an arithmetic number, because the mean of its divisors is an integer number (1356901).

Almost surely, 2^28687248 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 28687248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40707030).

28687248 is an abundant number, since it is smaller than the sum of its proper divisors (52726812).

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

28687248 is a wasteful number, since it uses less digits than its factorization.

28687248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2816 (or 2807 counting only the distinct ones).

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

The square root of 28687248 is about 5356.0477966501. The cubic root of 28687248 is about 306.1232362777.

The spelling of 28687248 in words is "twenty-eight million, six hundred eighty-seven thousand, two hundred forty-eight".