28258261 has 2 divisors, whose sum is σ = 28258262. Its totient is φ = 28258260.

The previous prime is 28258253. The next prime is 28258277. The reversal of 28258261 is 16285282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21446161 + 6812100 = 4631^2 + 2610^2 .

It is a cyclic number.

It is not a de Polignac number, because 28258261 - 2³ = 28258253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28258231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14129130 + 14129131.

It is an arithmetic number, because the mean of its divisors is an integer number (14129131).

Almost surely, 2^28258261 is an apocalyptic number.

It is an amenable number.

28258261 is a deficient number, since it is larger than the sum of its proper divisors (1).

28258261 is an equidigital number, since it uses as much as digits as its factorization.

28258261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15360, while the sum is 34.

The square root of 28258261 is about 5315.8499790720. The cubic root of 28258261 is about 304.5896515131.

The spelling of 28258261 in words is "twenty-eight million, two hundred fifty-eight thousand, two hundred sixty-one".