28087328 has 24 divisors (see below), whose sum is σ = 56207340. Its totient is φ = 13812480.

The previous prime is 28087327. The next prime is 28087331. The reversal of 28087328 is 82378082.

It can be written as a sum of positive squares in 2 ways, for example, as 23541904 + 4545424 = 4852^2 + 2132^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28087291 and 28087300.

It is not an unprimeable number, because it can be changed into a prime (28087321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5243 + ... + 9146.

Almost surely, 2^28087328 is an apocalyptic number.

It is an amenable number.

28087328 is an abundant number, since it is smaller than the sum of its proper divisors (28120012).

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

28087328 is a wasteful number, since it uses less digits than its factorization.

28087328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14460 (or 14452 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 38.

The square root of 28087328 is about 5299.7479185335. The cubic root of 28087328 is about 303.9742591317.

The spelling of 28087328 in words is "twenty-eight million, eighty-seven thousand, three hundred twenty-eight".