26828191 has 4 divisors (see below), whose sum is σ = 28891912. Its totient is φ = 24764472.

The previous prime is 26828183. The next prime is 26828203. The reversal of 26828191 is 19182862.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 26828191 - 2³ = 26828183 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 26828191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26828111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1031841 + ... + 1031866.

It is an arithmetic number, because the mean of its divisors is an integer number (7222978).

Almost surely, 2^26828191 is an apocalyptic number.

26828191 is a deficient number, since it is larger than the sum of its proper divisors (2063721).

26828191 is a wasteful number, since it uses less digits than its factorization.

26828191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2063720.

The product of its digits is 13824, while the sum is 37.

The square root of 26828191 is about 5179.5937099352. The cubic root of 26828191 is about 299.3623158606.

The spelling of 26828191 in words is "twenty-six million, eight hundred twenty-eight thousand, one hundred ninety-one".