26278009 has 4 divisors (see below), whose sum is σ = 26288640. Its totient is φ = 26267380.

The previous prime is 26278001. The next prime is 26278061. The reversal of 26278009 is 90087262.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 26278009 - 2³ = 26278001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26278001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 552 + ... + 7270.

It is an arithmetic number, because the mean of its divisors is an integer number (6572160).

Almost surely, 2^26278009 is an apocalyptic number.

It is an amenable number.

26278009 is a deficient number, since it is larger than the sum of its proper divisors (10631).

26278009 is an equidigital number, since it uses as much as digits as its factorization.

26278009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10630.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 26278009 is about 5126.2080527423. The cubic root of 26278009 is about 297.3017637537.

The spelling of 26278009 in words is "twenty-six million, two hundred seventy-eight thousand, nine".