26728889 has 4 divisors (see below), whose sum is σ = 29158800. Its totient is φ = 24298980.

The previous prime is 26728883. The next prime is 26728901. The reversal of 26728889 is 98882762.

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 26728889 - 2²⁰ = 25680313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (26728883) 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, 1214939 + ... + 1214960.

It is an arithmetic number, because the mean of its divisors is an integer number (7289700).

Almost surely, 2^26728889 is an apocalyptic number.

It is an amenable number.

26728889 is a deficient number, since it is larger than the sum of its proper divisors (2429911).

26728889 is a wasteful number, since it uses less digits than its factorization.

26728889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2429910.

The product of its digits is 774144, while the sum is 50.

The square root of 26728889 is about 5169.9989361701. The cubic root of 26728889 is about 298.9925054888.

The spelling of 26728889 in words is "twenty-six million, seven hundred twenty-eight thousand, eight hundred eighty-nine".