26890865 has 4 divisors (see below), whose sum is σ = 32269044. Its totient is φ = 21512688.

The previous prime is 26890849. The next prime is 26890879. The reversal of 26890865 is 56809862.

It is a happy number.

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 5721664 + 21169201 = 2392^2 + 4601^2 .

It is a cyclic number.

It is not a de Polignac number, because 26890865 - 2⁴ = 26890849 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2689082 + ... + 2689091.

It is an arithmetic number, because the mean of its divisors is an integer number (8067261).

Almost surely, 2^26890865 is an apocalyptic number.

It is an amenable number.

26890865 is a deficient number, since it is larger than the sum of its proper divisors (5378179).

26890865 is an equidigital number, since it uses as much as digits as its factorization.

26890865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5378178.

The product of its (nonzero) digits is 207360, while the sum is 44.

The square root of 26890865 is about 5185.6402690507. The cubic root of 26890865 is about 299.5952504679.

The spelling of 26890865 in words is "twenty-six million, eight hundred ninety thousand, eight hundred sixty-five".