26981865 has 12 divisors (see below), whose sum is σ = 46768644. Its totient is φ = 14390304.

The previous prime is 26981849. The next prime is 26981887. The reversal of 26981865 is 56818962.

It can be written as a sum of positive squares in 2 ways, for example, as 2893401 + 24088464 = 1701^2 + 4908^2 .

It is not a de Polignac number, because 26981865 - 2⁴ = 26981849 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 599597 = 26981865 / (2 + 6 + 9 + 8 + 1 + 8 + 6 + 5).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 26981865.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 299754 + ... + 299843.

It is an arithmetic number, because the mean of its divisors is an integer number (3897387).

Almost surely, 2^26981865 is an apocalyptic number.

It is an amenable number.

26981865 is a deficient number, since it is larger than the sum of its proper divisors (19786779).

26981865 is a wasteful number, since it uses less digits than its factorization.

26981865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 599608 (or 599605 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 26981865 is about 5194.4070883981. The cubic root of 26981865 is about 299.9328182898.

The spelling of 26981865 in words is "twenty-six million, nine hundred eighty-one thousand, eight hundred sixty-five".