26328781 has 12 divisors (see below), whose sum is σ = 27818100. Its totient is φ = 24886400.

The previous prime is 26328779. The next prime is 26328787. The reversal of 26328781 is 18782362.

It can be written as a sum of positive squares in 6 ways, for example, as 4622500 + 21706281 = 2150^2 + 4659^2 .

It is not a de Polignac number, because 26328781 - 2¹ = 26328779 is a prime.

It is a super-2 number, since 2×26328781² = 1386409417891922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 26328781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26328787) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 260631 + ... + 260731.

It is an arithmetic number, because the mean of its divisors is an integer number (2318175).

Almost surely, 2^26328781 is an apocalyptic number.

It is an amenable number.

26328781 is a deficient number, since it is larger than the sum of its proper divisors (1489319).

26328781 is an equidigital number, since it uses as much as digits as its factorization.

26328781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320 (or 219 counting only the distinct ones).

The product of its digits is 32256, while the sum is 37.

The square root of 26328781 is about 5131.1578615357. The cubic root of 26328781 is about 297.4931137921.

The spelling of 26328781 in words is "twenty-six million, three hundred twenty-eight thousand, seven hundred eighty-one".