26315681 has 8 divisors (see below), whose sum is σ = 30132480. Its totient is φ = 22513248.

The previous prime is 26315671. The next prime is 26315689. The reversal of 26315681 is 18651362.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 26315681 - 2⁶ = 26315617 is a prime.

It is a super-2 number, since 2×26315681² = 1385030132987522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (26315689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 680 + ... + 7286.

It is an arithmetic number, because the mean of its divisors is an integer number (3766560).

Almost surely, 2^26315681 is an apocalyptic number.

It is an amenable number.

26315681 is a deficient number, since it is larger than the sum of its proper divisors (3816799).

26315681 is an equidigital number, since it uses as much as digits as its factorization.

26315681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7183.

The product of its digits is 8640, while the sum is 32.

The square root of 26315681 is about 5129.8811877080. The cubic root of 26315681 is about 297.4437659406.

The spelling of 26315681 in words is "twenty-six million, three hundred fifteen thousand, six hundred eighty-one".