26989663 has 4 divisors (see below), whose sum is σ = 27002160. Its totient is φ = 26977168.

The previous prime is 26989661. The next prime is 26989679. The reversal of 26989663 is 36698962.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 36698962 = 2 ⋅18349481.

It is a cyclic number.

It is not a de Polignac number, because 26989663 - 2¹ = 26989661 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26989661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2083 + ... + 7636.

It is an arithmetic number, because the mean of its divisors is an integer number (6750540).

Almost surely, 2^26989663 is an apocalyptic number.

26989663 is a deficient number, since it is larger than the sum of its proper divisors (12497).

26989663 is an equidigital number, since it uses as much as digits as its factorization.

26989663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12496.

The product of its digits is 839808, while the sum is 49.

The square root of 26989663 is about 5195.1576491960. The cubic root of 26989663 is about 299.9617099279.

The spelling of 26989663 in words is "twenty-six million, nine hundred eighty-nine thousand, six hundred sixty-three".