26318681 has 4 divisors (see below), whose sum is σ = 26579364. Its totient is φ = 26058000.

The previous prime is 26318657. The next prime is 26318723. The reversal of 26318681 is 18681362.

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 18139081 + 8179600 = 4259^2 + 2860^2 .

It is a de Polignac number, because none of the positive numbers 2^k-26318681 is a prime.

It is a super-2 number, since 2×26318681² = 1385345939159522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26318641) 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, 130190 + ... + 130391.

It is an arithmetic number, because the mean of its divisors is an integer number (6644841).

Almost surely, 2^26318681 is an apocalyptic number.

It is an amenable number.

26318681 is a deficient number, since it is larger than the sum of its proper divisors (260683).

26318681 is a wasteful number, since it uses less digits than its factorization.

26318681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260682.

The product of its digits is 13824, while the sum is 35.

The square root of 26318681 is about 5130.1735838079. The cubic root of 26318681 is about 297.4550684209.

The spelling of 26318681 in words is "twenty-six million, three hundred eighteen thousand, six hundred eighty-one".