26815013 has 4 divisors (see below), whose sum is σ = 27052428. Its totient is φ = 26577600.

The previous prime is 26815007. The next prime is 26815021. The reversal of 26815013 is 31051862.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5866084 + 20948929 = 2422^2 + 4577^2 .

It is a de Polignac number, because none of the positive numbers 2^k-26815013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26815073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118538 + ... + 118763.

It is an arithmetic number, because the mean of its divisors is an integer number (6763107).

Almost surely, 2^26815013 is an apocalyptic number.

It is an amenable number.

26815013 is a deficient number, since it is larger than the sum of its proper divisors (237415).

26815013 is a wasteful number, since it uses less digits than its factorization.

26815013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237414.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 26815013 is about 5178.3214461831. The cubic root of 26815013 is about 299.3132922706.

Adding to 26815013 its reverse (31051862), we get a palindrome (57866875).

The spelling of 26815013 in words is "twenty-six million, eight hundred fifteen thousand, thirteen".