26728306605 has 576 divisors, whose sum is σ = 68119833600. Its totient is φ = 9510359040.

The previous prime is 26728306573. The next prime is 26728306637. The reversal of 26728306605 is 50660382762.

It is a happy number.

26728306605 is a `hidden beast` number, since 2 + 6 + 7 + 2 + 8 + 30 + 6 + 605 = 666.

It is an interprime number because it is at equal distance from previous prime (26728306573) and next prime (26728306637).

It is not a de Polignac number, because 26728306605 - 2⁵ = 26728306573 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 575 ways as a sum of consecutive naturals, for example, 338332956 + ... + 338333034.

It is an arithmetic number, because the mean of its divisors is an integer number (118263600).

Almost surely, 2^26728306605 is an apocalyptic number.

It is an amenable number.

26728306605 is an abundant number, since it is smaller than the sum of its proper divisors (41391526995).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

26728306605 is a wasteful number, since it uses less digits than its factorization.

26728306605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194 (or 184 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

It can be divided in two parts, 26728 and 306605, that added together give a palindrome (333333).

The spelling of 26728306605 in words is "twenty-six billion, seven hundred twenty-eight million, three hundred six thousand, six hundred five".