26516781 has 8 divisors (see below), whose sum is σ = 39284160. Its totient is φ = 17677836.

The previous prime is 26516779. The next prime is 26516797. The reversal of 26516781 is 18761562.

It is not a de Polignac number, because 26516781 - 2¹ = 26516779 is a prime.

It is a super-2 number, since 2×26516781² = 1406279349203922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26516731) 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, 491025 + ... + 491078.

It is an arithmetic number, because the mean of its divisors is an integer number (4910520).

Almost surely, 2^26516781 is an apocalyptic number.

It is an amenable number.

26516781 is a deficient number, since it is larger than the sum of its proper divisors (12767379).

26516781 is an equidigital number, since it uses as much as digits as its factorization.

26516781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 982112 (or 982106 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 26516781 is about 5149.4447273468. Note that the first 3 decimals coincide. The cubic root of 26516781 is about 298.1995158063.

The spelling of 26516781 in words is "twenty-six million, five hundred sixteen thousand, seven hundred eighty-one".