26840561 has 8 divisors (see below), whose sum is σ = 29512704. Its totient is φ = 24207120.

The previous prime is 26840537. The next prime is 26840599. The reversal of 26840561 is 16504862.

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

It is a cyclic number.

It is not a de Polignac number, because 26840561 - 2¹⁰ = 26839537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26842561) 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, 8210 + ... + 11003.

It is an arithmetic number, because the mean of its divisors is an integer number (3689088).

Almost surely, 2^26840561 is an apocalyptic number.

It is an amenable number.

26840561 is a deficient number, since it is larger than the sum of its proper divisors (2672143).

26840561 is a wasteful number, since it uses less digits than its factorization.

26840561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19351.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 26840561 is about 5180.7876814245. The cubic root of 26840561 is about 299.4083189977.

The spelling of 26840561 in words is "twenty-six million, eight hundred forty thousand, five hundred sixty-one".