28281868 has 6 divisors (see below), whose sum is σ = 49493276. Its totient is φ = 14140932.

The previous prime is 28281817. The next prime is 28281871. The reversal of 28281868 is 86818282.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3535230 + ... + 3535237.

Almost surely, 2^28281868 is an apocalyptic number.

It is an amenable number.

28281868 is a deficient number, since it is larger than the sum of its proper divisors (21211408).

28281868 is a wasteful number, since it uses less digits than its factorization.

28281868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7070471 (or 7070469 counting only the distinct ones).

The product of its digits is 98304, while the sum is 43.

The square root of 28281868 is about 5318.0699506494. The cubic root of 28281868 is about 304.6744461451.

The spelling of 28281868 in words is "twenty-eight million, two hundred eighty-one thousand, eight hundred sixty-eight".