26388561 has 4 divisors (see below), whose sum is σ = 35184752. Its totient is φ = 17592372.

The previous prime is 26388491. The next prime is 26388569. The reversal of 26388561 is 16588362.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 26388561 - 2⁷ = 26388433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26388569) 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, 4398091 + ... + 4398096.

It is an arithmetic number, because the mean of its divisors is an integer number (8796188).

Almost surely, 2^26388561 is an apocalyptic number.

It is an amenable number.

26388561 is a deficient number, since it is larger than the sum of its proper divisors (8796191).

26388561 is an equidigital number, since it uses as much as digits as its factorization.

26388561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8796190.

The product of its digits is 69120, while the sum is 39.

The square root of 26388561 is about 5136.9797546808. The cubic root of 26388561 is about 297.7180981992.

The spelling of 26388561 in words is "twenty-six million, three hundred eighty-eight thousand, five hundred sixty-one".