28568231 has 4 divisors (see below), whose sum is σ = 29810352. Its totient is φ = 27326112.

The previous prime is 28568227. The next prime is 28568237. The reversal of 28568231 is 13286582.

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

It is a cyclic number.

It is not a de Polignac number, because 28568231 - 2² = 28568227 is a prime.

It is a super-2 number, since 2×28568231² = 1632287644938722, 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 = 28568191 and 28568200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28568237) 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, 621026 + ... + 621071.

It is an arithmetic number, because the mean of its divisors is an integer number (7452588).

Almost surely, 2^28568231 is an apocalyptic number.

28568231 is a deficient number, since it is larger than the sum of its proper divisors (1242121).

28568231 is a wasteful number, since it uses less digits than its factorization.

28568231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1242120.

The product of its digits is 23040, while the sum is 35.

The square root of 28568231 is about 5344.9257244605. The cubic root of 28568231 is about 305.6993037694.

The spelling of 28568231 in words is "twenty-eight million, five hundred sixty-eight thousand, two hundred thirty-one".