26904561 has 4 divisors (see below), whose sum is σ = 35872752. Its totient is φ = 17936372.

The previous prime is 26904491. The next prime is 26904593. The reversal of 26904561 is 16540962.

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 a cyclic number.

It is not a de Polignac number, because 26904561 - 2⁹ = 26904049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (26904461) 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, 4484091 + ... + 4484096.

It is an arithmetic number, because the mean of its divisors is an integer number (8968188).

Almost surely, 2^26904561 is an apocalyptic number.

It is an amenable number.

26904561 is a deficient number, since it is larger than the sum of its proper divisors (8968191).

26904561 is an equidigital number, since it uses as much as digits as its factorization.

26904561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8968190.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 26904561 is about 5186.9606707589. The cubic root of 26904561 is about 299.6461049139.

The spelling of 26904561 in words is "twenty-six million, nine hundred four thousand, five hundred sixty-one".