28281867 has 8 divisors (see below), whose sum is σ = 37927824. Its totient is φ = 18745248.

The previous prime is 28281817. The next prime is 28281871. The reversal of 28281867 is 76818282.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28281867 - 2⁷ = 28281739 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28281817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26728 + ... + 27765.

It is an arithmetic number, because the mean of its divisors is an integer number (4740978).

Almost surely, 2^28281867 is an apocalyptic number.

28281867 is a deficient number, since it is larger than the sum of its proper divisors (9645957).

28281867 is a wasteful number, since it uses less digits than its factorization.

28281867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54669.

The product of its digits is 86016, while the sum is 42.

The square root of 28281867 is about 5318.0698566303. The cubic root of 28281867 is about 304.6744425542.

The spelling of 28281867 in words is "twenty-eight million, two hundred eighty-one thousand, eight hundred sixty-seven".