26128563 has 16 divisors (see below), whose sum is σ = 36263040. Its totient is φ = 16720704.

The previous prime is 26128561. The next prime is 26128573. The reversal of 26128563 is 36582162.

It is not a de Polignac number, because 26128563 - 2¹ = 26128561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (26128561) 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 15 ways as a sum of consecutive naturals, for example, 5895 + ... + 9327.

It is an arithmetic number, because the mean of its divisors is an integer number (2266440).

Almost surely, 2^26128563 is an apocalyptic number.

26128563 is a deficient number, since it is larger than the sum of its proper divisors (10134477).

26128563 is a wasteful number, since it uses less digits than its factorization.

26128563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3538.

The product of its digits is 17280, while the sum is 33.

The square root of 26128563 is about 5111.6106072353. The cubic root of 26128563 is about 296.7370957365.

It can be divided in two parts, 2612 and 8563, that added together give a triangular number (11175 = T₁₄₉).

The spelling of 26128563 in words is "twenty-six million, one hundred twenty-eight thousand, five hundred sixty-three".