28243831 has 16 divisors (see below), whose sum is σ = 35815680. Its totient is φ = 21631680.

The previous prime is 28243811. The next prime is 28243837. The reversal of 28243831 is 13834282.

It is not a de Polignac number, because 28243831 - 2¹⁷ = 28112759 is a prime.

It is a super-2 number, since 2×28243831² = 1595427979113122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28243793 and 28243802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28243837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1435 + ... + 7651.

It is an arithmetic number, because the mean of its divisors is an integer number (2238480).

Almost surely, 2^28243831 is an apocalyptic number.

28243831 is a deficient number, since it is larger than the sum of its proper divisors (7571849).

28243831 is a wasteful number, since it uses less digits than its factorization.

28243831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6294.

The product of its digits is 9216, while the sum is 31.

The square root of 28243831 is about 5314.4925439782. The cubic root of 28243831 is about 304.5377967414.

It can be divided in two parts, 282438 and 31, that multiplied together give a palindrome (8755578).

The spelling of 28243831 in words is "twenty-eight million, two hundred forty-three thousand, eight hundred thirty-one".