26405505 has 48 divisors (see below), whose sum is σ = 55396224. Its totient is φ = 11358720.

The previous prime is 26405479. The next prime is 26405507. The reversal of 26405505 is 50550462.

It is not a de Polignac number, because 26405505 - 2¹¹ = 26403457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (26405507) 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 47 ways as a sum of consecutive naturals, for example, 2890 + ... + 7820.

It is an arithmetic number, because the mean of its divisors is an integer number (1154088).

Almost surely, 2^26405505 is an apocalyptic number.

It is an amenable number.

26405505 is an abundant number, since it is smaller than the sum of its proper divisors (28990719).

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

26405505 is a wasteful number, since it uses less digits than its factorization.

26405505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4966 (or 4963 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 26405505 is about 5138.6287081283. The cubic root of 26405505 is about 297.7818058053.

Adding to 26405505 its reverse (50550462), we get a palindrome (76955967).

The spelling of 26405505 in words is "twenty-six million, four hundred five thousand, five hundred five".