28383831 has 32 divisors (see below), whose sum is σ = 48691200. Its totient is φ = 16005600.

The previous prime is 28383811. The next prime is 28383857. The reversal of 28383831 is 13838382.

It is not a de Polignac number, because 28383831 - 2⁵ = 28383799 is a prime.

It is a super-2 number, since 2×28383831² = 1611283724473122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28383811) 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 31 ways as a sum of consecutive naturals, for example, 13981 + ... + 15881.

It is an arithmetic number, because the mean of its divisors is an integer number (1521600).

Almost surely, 2^28383831 is an apocalyptic number.

28383831 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28383831 is a deficient number, since it is larger than the sum of its proper divisors (20307369).

28383831 is a wasteful number, since it uses less digits than its factorization.

28383831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1996 (or 1990 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 28383831 is about 5327.6477924127. The cubic root of 28383831 is about 305.0401487952.

It can be divided in two parts, 283838 and 31, that multiplied together give a palindrome (8798978).

The spelling of 28383831 in words is "twenty-eight million, three hundred eighty-three thousand, eight hundred thirty-one".