28066831 has 32 divisors (see below), whose sum is σ = 33707520. Its totient is φ = 23151744.

The previous prime is 28066793. The next prime is 28066879. The reversal of 28066831 is 13866082.

It is a cyclic number.

It is not a de Polignac number, because 28066831 - 2⁹ = 28066319 is a prime.

It is a super-2 number, since 2×28066831² = 1575494004765122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28066891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 475680 + ... + 475738.

It is an arithmetic number, because the mean of its divisors is an integer number (1053360).

Almost surely, 2^28066831 is an apocalyptic number.

28066831 is a deficient number, since it is larger than the sum of its proper divisors (5640689).

28066831 is a wasteful number, since it uses less digits than its factorization.

28066831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 28066831 is about 5297.8137943873. The cubic root of 28066831 is about 303.9002984164.

The spelling of 28066831 in words is "twenty-eight million, sixty-six thousand, eight hundred thirty-one".