26913681 has 8 divisors (see below), whose sum is σ = 39872160. Its totient is φ = 17942436.

The previous prime is 26913661. The next prime is 26913697. The reversal of 26913681 is 18631962.

It is not a de Polignac number, because 26913681 - 2¹⁰ = 26912657 is a prime.

It is a super-2 number, since 2×26913681² = 1448692449939522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (26913631) 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 7 ways as a sum of consecutive naturals, for example, 498375 + ... + 498428.

It is an arithmetic number, because the mean of its divisors is an integer number (4984020).

Almost surely, 2^26913681 is an apocalyptic number.

It is an amenable number.

26913681 is a deficient number, since it is larger than the sum of its proper divisors (12958479).

26913681 is an equidigital number, since it uses as much as digits as its factorization.

26913681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 996812 (or 996806 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 26913681 is about 5187.8397238157. The cubic root of 26913681 is about 299.6799587000.

The spelling of 26913681 in words is "twenty-six million, nine hundred thirteen thousand, six hundred eighty-one".