28128368 has 40 divisors (see below), whose sum is σ = 56246400. Its totient is φ = 13621184.

The previous prime is 28128367. The next prime is 28128383. The reversal of 28128368 is 86382182.

Together with 28118032 it forms an amicable pair .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28128367) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78173 + ... + 78531.

It is an arithmetic number, because the mean of its divisors is an integer number (1406160).

Almost surely, 2^28128368 is an apocalyptic number.

It is an amenable number.

28128368 is a deficient number, since it is larger than the sum of its proper divisors (28118032).

28128368 is a wasteful number, since it uses less digits than its factorization.

28128368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509 (or 503 counting only the distinct ones).

The product of its digits is 36864, while the sum is 38.

The square root of 28128368 is about 5303.6183874785. The cubic root of 28128368 is about 304.1222384683.

The spelling of 28128368 in words is "twenty-eight million, one hundred twenty-eight thousand, three hundred sixty-eight".