28298231 has 8 divisors (see below), whose sum is σ = 30893520. Its totient is φ = 25762752.

The previous prime is 28298213. The next prime is 28298261. The reversal of 28298231 is 13289282.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28298231 is a prime.

It is a super-2 number, since 2×28298231² = 1601579755458722, 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 = 28298191 and 28298200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28298261) 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 7 ways as a sum of consecutive naturals, for example, 13961 + ... + 15858.

It is an arithmetic number, because the mean of its divisors is an integer number (3861690).

Almost surely, 2^28298231 is an apocalyptic number.

28298231 is a deficient number, since it is larger than the sum of its proper divisors (2595289).

28298231 is a wasteful number, since it uses less digits than its factorization.

28298231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29905.

The product of its digits is 13824, while the sum is 35.

The square root of 28298231 is about 5319.6081622616. The cubic root of 28298231 is about 304.7331931700.

The spelling of 28298231 in words is "twenty-eight million, two hundred ninety-eight thousand, two hundred thirty-one".