26821863 has 24 divisors (see below), whose sum is σ = 41212080. Its totient is φ = 16761600.

The previous prime is 26821853. The next prime is 26821867. The reversal of 26821863 is 36812862.

It is not a de Polignac number, because 26821863 - 2¹⁴ = 26805479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26821867) 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 23 ways as a sum of consecutive naturals, for example, 16495 + ... + 18047.

It is an arithmetic number, because the mean of its divisors is an integer number (1717170).

Almost surely, 2^26821863 is an apocalyptic number.

26821863 is a deficient number, since it is larger than the sum of its proper divisors (14390217).

26821863 is a wasteful number, since it uses less digits than its factorization.

26821863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1679 (or 1676 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 26821863 is about 5178.9828151868. The cubic root of 26821863 is about 299.3387770180.

Subtracting 26821863 from its reverse (36812862), we obtain a palindrome (9990999).

The spelling of 26821863 in words is "twenty-six million, eight hundred twenty-one thousand, eight hundred sixty-three".