28026861 has 4 divisors (see below), whose sum is σ = 37369152. Its totient is φ = 18684572.

The previous prime is 28026853. The next prime is 28026893. The reversal of 28026861 is 16862082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28026861 - 2³ = 28026853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28026161) 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 in 3 ways as a sum of consecutive naturals, for example, 4671141 + ... + 4671146.

It is an arithmetic number, because the mean of its divisors is an integer number (9342288).

Almost surely, 2^28026861 is an apocalyptic number.

It is an amenable number.

28026861 is a deficient number, since it is larger than the sum of its proper divisors (9342291).

28026861 is an equidigital number, since it uses as much as digits as its factorization.

28026861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9342290.

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 28026861 is about 5294.0401396287. The cubic root of 28026861 is about 303.7559683157.

The spelling of 28026861 in words is "twenty-eight million, twenty-six thousand, eight hundred sixty-one".