28589261 has 2 divisors, whose sum is σ = 28589262. Its totient is φ = 28589260.

The previous prime is 28589237. The next prime is 28589263. The reversal of 28589261 is 16298582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14668900 + 13920361 = 3830^2 + 3731^2 .

It is a cyclic number.

It is not a de Polignac number, because 28589261 - 2²² = 24394957 is a prime.

It is a super-2 number, since 2×28589261² = 1634691689052242, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 28589263, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28589263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14294630 + 14294631.

It is an arithmetic number, because the mean of its divisors is an integer number (14294631).

Almost surely, 2^28589261 is an apocalyptic number.

It is an amenable number.

28589261 is a deficient number, since it is larger than the sum of its proper divisors (1).

28589261 is an equidigital number, since it uses as much as digits as its factorization.

28589261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 41.

The square root of 28589261 is about 5346.8926490065. The cubic root of 28589261 is about 305.7742970899.

The spelling of 28589261 in words is "twenty-eight million, five hundred eighty-nine thousand, two hundred sixty-one".