26720561 has 8 divisors (see below), whose sum is σ = 31282944. Its totient is φ = 22344480.

The previous prime is 26720539. The next prime is 26720563. The reversal of 26720561 is 16502762.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26720561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (26720563) 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, 46265 + ... + 46838.

It is an arithmetic number, because the mean of its divisors is an integer number (3910368).

Almost surely, 2^26720561 is an apocalyptic number.

It is an amenable number.

26720561 is a deficient number, since it is larger than the sum of its proper divisors (4562383).

26720561 is an equidigital number, since it uses as much as digits as its factorization.

26720561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93151.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 26720561 is about 5169.1934573974. The cubic root of 26720561 is about 298.9614495997.

The spelling of 26720561 in words is "twenty-six million, seven hundred twenty thousand, five hundred sixty-one".