26409561 has 8 divisors (see below), whose sum is σ = 35267040. Its totient is φ = 17579232.

The previous prime is 26409557. The next prime is 26409571. The reversal of 26409561 is 16590462.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 26409561 - 2² = 26409557 is a prime.

It is a super-4 number, since 4×26409561⁴ (a number of 31 digits) contains 4444 as substring. Note that it is a super-d number also for d = 3.

It is not an unprimeable number, because it can be changed into a prime (26409571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4396 + ... + 8493.

It is an arithmetic number, because the mean of its divisors is an integer number (4408380).

Almost surely, 2^26409561 is an apocalyptic number.

It is an amenable number.

26409561 is a deficient number, since it is larger than the sum of its proper divisors (8857479).

26409561 is a wasteful number, since it uses less digits than its factorization.

26409561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13575.

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

The square root of 26409561 is about 5139.0233507934. The cubic root of 26409561 is about 297.7970518833.

The spelling of 26409561 in words is "twenty-six million, four hundred nine thousand, five hundred sixty-one".