26887681 has 2 divisors, whose sum is σ = 26887682. Its totient is φ = 26887680.

The previous prime is 26887673. The next prime is 26887691. The reversal of 26887681 is 18678862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17640000 + 9247681 = 4200^2 + 3041^2 .

It is a cyclic number.

It is not a de Polignac number, because 26887681 - 2³ = 26887673 is a prime.

It is a super-2 number, since 2×26887681² = 1445894779115522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (26887691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13443840 + 13443841.

It is an arithmetic number, because the mean of its divisors is an integer number (13443841).

Almost surely, 2^26887681 is an apocalyptic number.

It is an amenable number.

26887681 is a deficient number, since it is larger than the sum of its proper divisors (1).

26887681 is an equidigital number, since it uses as much as digits as its factorization.

26887681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 258048, while the sum is 46.

The square root of 26887681 is about 5185.3332583355. Note that the first 3 decimals coincide. The cubic root of 26887681 is about 299.5834255238.

The spelling of 26887681 in words is "twenty-six million, eight hundred eighty-seven thousand, six hundred eighty-one".