26288261 has 4 divisors (see below), whose sum is σ = 26559372. Its totient is φ = 26017152.

The previous prime is 26288243. The next prime is 26288281. The reversal of 26288261 is 16288262.

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 10336225 + 15952036 = 3215^2 + 3994^2 .

It is a cyclic number.

It is not a de Polignac number, because 26288261 - 2¹⁴ = 26271877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26288221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135410 + ... + 135603.

It is an arithmetic number, because the mean of its divisors is an integer number (6639843).

Almost surely, 2^26288261 is an apocalyptic number.

It is an amenable number.

26288261 is a deficient number, since it is larger than the sum of its proper divisors (271111).

26288261 is an equidigital number, since it uses as much as digits as its factorization.

26288261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271110.

The product of its digits is 18432, while the sum is 35.

The square root of 26288261 is about 5127.2079146452. The cubic root of 26288261 is about 297.3404214439.

Subtracting from 26288261 its reverse (16288262), we obtain a palindrome (9999999).

The spelling of 26288261 in words is "twenty-six million, two hundred eighty-eight thousand, two hundred sixty-one".