26663431 has 4 divisors (see below), whose sum is σ = 26694712. Its totient is φ = 26632152.

The previous prime is 26663423. The next prime is 26663443. The reversal of 26663431 is 13436662.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13436662 = 2 ⋅6718331.

It is a cyclic number.

It is not a de Polignac number, because 26663431 - 2³ = 26663423 is a prime.

It is a super-2 number, since 2×26663431² = 1421877105383522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 26663393 and 26663402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26663491) 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, 14325 + ... + 16078.

It is an arithmetic number, because the mean of its divisors is an integer number (6673678).

Almost surely, 2^26663431 is an apocalyptic number.

26663431 is a deficient number, since it is larger than the sum of its proper divisors (31281).

26663431 is an equidigital number, since it uses as much as digits as its factorization.

26663431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31280.

The product of its digits is 15552, while the sum is 31.

The square root of 26663431 is about 5163.6644933613. The cubic root of 26663431 is about 298.7482323384.

The spelling of 26663431 in words is "twenty-six million, six hundred sixty-three thousand, four hundred thirty-one".