26640611 has 4 divisors (see below), whose sum is σ = 27290424. Its totient is φ = 25990800.

The previous prime is 26640599. The next prime is 26640631. The reversal of 26640611 is 11604662.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11604662 = 2 ⋅5802331.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26640611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26640631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 324845 + ... + 324926.

It is an arithmetic number, because the mean of its divisors is an integer number (6822606).

Almost surely, 2^26640611 is an apocalyptic number.

26640611 is a deficient number, since it is larger than the sum of its proper divisors (649813).

26640611 is an equidigital number, since it uses as much as digits as its factorization.

26640611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649812.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 26640611 is about 5161.4543493089. The cubic root of 26640611 is about 298.6629797379.

The spelling of 26640611 in words is "twenty-six million, six hundred forty thousand, six hundred eleven".