28828231 has 2 divisors, whose sum is σ = 28828232. Its totient is φ = 28828230.

The previous prime is 28828213. The next prime is 28828259. The reversal of 28828231 is 13282882.

Together with previous prime (28828213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28828231 - 2⁵ = 28828199 is a prime.

It is a super-2 number, since 2×28828231² = 1662133805178722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28828031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14414115 + 14414116.

It is an arithmetic number, because the mean of its divisors is an integer number (14414116).

Almost surely, 2^28828231 is an apocalyptic number.

28828231 is a deficient number, since it is larger than the sum of its proper divisors (1).

28828231 is an equidigital number, since it uses as much as digits as its factorization.

28828231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12288, while the sum is 34.

The square root of 28828231 is about 5369.1927698677. The cubic root of 28828231 is about 306.6238961828.

It can be divided in two parts, 288 and 28231, that multiplied together give a triangular number (8130528 = T₄₀₃₂).

The spelling of 28828231 in words is "twenty-eight million, eight hundred twenty-eight thousand, two hundred thirty-one".