28269831 has 4 divisors (see below), whose sum is σ = 37693112. Its totient is φ = 18846552.

The previous prime is 28269823. The next prime is 28269841. The reversal of 28269831 is 13896282.

It is a happy number.

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

It is not a de Polignac number, because 28269831 - 2³ = 28269823 is a prime.

It is a super-2 number, since 2×28269831² = 1598366689537122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28269831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28269841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4711636 + ... + 4711641.

It is an arithmetic number, because the mean of its divisors is an integer number (9423278).

Almost surely, 2^28269831 is an apocalyptic number.

28269831 is a deficient number, since it is larger than the sum of its proper divisors (9423281).

28269831 is an equidigital number, since it uses as much as digits as its factorization.

28269831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9423280.

The product of its digits is 41472, while the sum is 39.

The square root of 28269831 is about 5316.9381226416. The cubic root of 28269831 is about 304.6312160124.

The spelling of 28269831 in words is "twenty-eight million, two hundred sixty-nine thousand, eight hundred thirty-one".