28238591 has 2 divisors, whose sum is σ = 28238592. Its totient is φ = 28238590.

The previous prime is 28238569. The next prime is 28238597. The reversal of 28238591 is 19583282.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28238591 - 2⁶ = 28238527 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28238597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14119295 + 14119296.

It is an arithmetic number, because the mean of its divisors is an integer number (14119296).

Almost surely, 2^28238591 is an apocalyptic number.

28238591 is a deficient number, since it is larger than the sum of its proper divisors (1).

28238591 is an equidigital number, since it uses as much as digits as its factorization.

28238591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 38.

The square root of 28238591 is about 5313.9995295446. Note that the first 3 decimals coincide. The cubic root of 28238591 is about 304.5189622243.

The spelling of 28238591 in words is "twenty-eight million, two hundred thirty-eight thousand, five hundred ninety-one".