28502231 has 2 divisors, whose sum is σ = 28502232. Its totient is φ = 28502230.

The previous prime is 28502197. The next prime is 28502239. The reversal of 28502231 is 13220582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28502231 - 2¹⁸ = 28240087 is a prime.

It is a super-2 number, since 2×28502231² = 1624754343954722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28502197 and 28502206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28502239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14251115 + 14251116.

It is an arithmetic number, because the mean of its divisors is an integer number (14251116).

Almost surely, 2^28502231 is an apocalyptic number.

28502231 is a deficient number, since it is larger than the sum of its proper divisors (1).

28502231 is an equidigital number, since it uses as much as digits as its factorization.

28502231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 28502231 is about 5338.7480742211. The cubic root of 28502231 is about 305.4637074363.

The spelling of 28502231 in words is "twenty-eight million, five hundred two thousand, two hundred thirty-one".