28383231 has 8 divisors (see below), whose sum is σ = 37886464. Its totient is φ = 18901080.

The previous prime is 28383221. The next prime is 28383263. The reversal of 28383231 is 13238382.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-28383231 is a prime.

It is a super-2 number, since 2×28383231² = 1611215603998722, 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 (28383221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1801 + ... + 7746.

It is an arithmetic number, because the mean of its divisors is an integer number (4735808).

Almost surely, 2^28383231 is an apocalyptic number.

28383231 is a deficient number, since it is larger than the sum of its proper divisors (9503233).

28383231 is an equidigital number, since it uses as much as digits as its factorization.

28383231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10541.

The product of its digits is 6912, while the sum is 30.

The square root of 28383231 is about 5327.5914820864. The cubic root of 28383231 is about 305.0379993863.

The spelling of 28383231 in words is "twenty-eight million, three hundred eighty-three thousand, two hundred thirty-one".