26646643 has 4 divisors (see below), whose sum is σ = 26882568. Its totient is φ = 26410720.

The previous prime is 26646611. The next prime is 26646661. The reversal of 26646643 is 34664662.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 26646643 - 2⁵ = 26646611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26646343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117793 + ... + 118018.

It is an arithmetic number, because the mean of its divisors is an integer number (6720642).

Almost surely, 2^26646643 is an apocalyptic number.

26646643 is a deficient number, since it is larger than the sum of its proper divisors (235925).

26646643 is a wasteful number, since it uses less digits than its factorization.

26646643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235924.

The product of its digits is 124416, while the sum is 37.

The square root of 26646643 is about 5162.0386476662. The cubic root of 26646643 is about 298.6855192502.

The spelling of 26646643 in words is "twenty-six million, six hundred forty-six thousand, six hundred forty-three".