28681859 has 4 divisors (see below), whose sum is σ = 28864704. Its totient is φ = 28499016.

The previous prime is 28681853. The next prime is 28681871. The reversal of 28681859 is 95818682.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28681859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28681853) 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 3 ways as a sum of consecutive naturals, for example, 91187 + ... + 91500.

It is an arithmetic number, because the mean of its divisors is an integer number (7216176).

Almost surely, 2^28681859 is an apocalyptic number.

28681859 is a deficient number, since it is larger than the sum of its proper divisors (182845).

28681859 is a wasteful number, since it uses less digits than its factorization.

28681859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182844.

The product of its digits is 276480, while the sum is 47.

The square root of 28681859 is about 5355.5446968539. The cubic root of 28681859 is about 306.1040663033.

The spelling of 28681859 in words is "twenty-eight million, six hundred eighty-one thousand, eight hundred fifty-nine".