28250861 has 2 divisors, whose sum is σ = 28250862. Its totient is φ = 28250860.

The previous prime is 28250837. The next prime is 28250863. The reversal of 28250861 is 16805282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24068836 + 4182025 = 4906^2 + 2045^2 .

It is a cyclic number.

It is not a de Polignac number, because 28250861 - 2¹⁴ = 28234477 is a prime.

It is a super-2 number, since 2×28250861² = 1596222294482642, which contains 22 as substring.

Together with 28250863, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28250863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14125430 + 14125431.

It is an arithmetic number, because the mean of its divisors is an integer number (14125431).

Almost surely, 2^28250861 is an apocalyptic number.

It is an amenable number.

28250861 is a deficient number, since it is larger than the sum of its proper divisors (1).

28250861 is an equidigital number, since it uses as much as digits as its factorization.

28250861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 28250861 is about 5315.1539018170. The cubic root of 28250861 is about 304.5630615282.

The spelling of 28250861 in words is "twenty-eight million, two hundred fifty thousand, eight hundred sixty-one".