28258661 has 2 divisors, whose sum is σ = 28258662. Its totient is φ = 28258660.

The previous prime is 28258627. The next prime is 28258663. The reversal of 28258661 is 16685282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22033636 + 6225025 = 4694^2 + 2495^2 .

It is a cyclic number.

It is not a de Polignac number, because 28258661 - 2¹⁸ = 27996517 is a prime.

It is a Sophie Germain prime.

Together with 28258663, 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 (28258663) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14129330 + 14129331.

It is an arithmetic number, because the mean of its divisors is an integer number (14129331).

Almost surely, 2^28258661 is an apocalyptic number.

It is an amenable number.

28258661 is a deficient number, since it is larger than the sum of its proper divisors (1).

28258661 is an equidigital number, since it uses as much as digits as its factorization.

28258661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46080, while the sum is 38.

The square root of 28258661 is about 5315.8876022730. The cubic root of 28258661 is about 304.5910886773.

The spelling of 28258661 in words is "twenty-eight million, two hundred fifty-eight thousand, six hundred sixty-one".