28354231 has 2 divisors, whose sum is σ = 28354232. Its totient is φ = 28354230.

The previous prime is 28354223. The next prime is 28354237. The reversal of 28354231 is 13245382.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28354231 - 2³ = 28354223 is a prime.

It is a super-2 number, since 2×28354231² = 1607924831202722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28354231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28354237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14177115 + 14177116.

It is an arithmetic number, because the mean of its divisors is an integer number (14177116).

Almost surely, 2^28354231 is an apocalyptic number.

28354231 is a deficient number, since it is larger than the sum of its proper divisors (1).

28354231 is an equidigital number, since it uses as much as digits as its factorization.

28354231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 28.

The square root of 28354231 is about 5324.8691063725. The cubic root of 28354231 is about 304.9340751541.

The spelling of 28354231 in words is "twenty-eight million, three hundred fifty-four thousand, two hundred thirty-one".