28245231 has 24 divisors (see below), whose sum is σ = 46903584. Its totient is φ = 16044480.

The previous prime is 28245227. The next prime is 28245241. The reversal of 28245231 is 13254282.

It is not a de Polignac number, because 28245231 - 2² = 28245227 is a prime.

It is a super-2 number, since 2×28245231² = 1595586148486722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28245195 and 28245204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28245241) 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 23 ways as a sum of consecutive naturals, for example, 10165 + ... + 12641.

It is an arithmetic number, because the mean of its divisors is an integer number (1954316).

Almost surely, 2^28245231 is an apocalyptic number.

28245231 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28245231 is a deficient number, since it is larger than the sum of its proper divisors (18658353).

28245231 is a wasteful number, since it uses less digits than its factorization.

28245231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2671 (or 2668 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 28245231 is about 5314.6242576498. The cubic root of 28245231 is about 304.5428284699.

The spelling of 28245231 in words is "twenty-eight million, two hundred forty-five thousand, two hundred thirty-one".