28231383 has 4 divisors (see below), whose sum is σ = 37641848. Its totient is φ = 18820920.

The previous prime is 28231289. The next prime is 28231387. The reversal of 28231383 is 38313282.

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

It is not a de Polignac number, because 28231383 - 2⁸ = 28231127 is a prime.

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 28231383.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28231387) 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, 4705228 + ... + 4705233.

It is an arithmetic number, because the mean of its divisors is an integer number (9410462).

Almost surely, 2^28231383 is an apocalyptic number.

28231383 is a deficient number, since it is larger than the sum of its proper divisors (9410465).

28231383 is an equidigital number, since it uses as much as digits as its factorization.

28231383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9410464.

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

The square root of 28231383 is about 5313.3212776944. The cubic root of 28231383 is about 304.4930501729.

The spelling of 28231383 in words is "twenty-eight million, two hundred thirty-one thousand, three hundred eighty-three".