26560989 has 72 divisors (see below), whose sum is σ = 49670712. Its totient is φ = 13547520.

The previous prime is 26560973. The next prime is 26560991. The reversal of 26560989 is 98906562.

26560989 is a `hidden beast` number, since 2 + 6 + 560 + 9 + 89 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 4235364 + 22325625 = 2058^2 + 4725^2 .

It is not a de Polignac number, because 26560989 - 2⁴ = 26560973 is a prime.

It is a super-2 number, since 2×26560989² = 1410972273316242, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26560949) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 234997 + ... + 235109.

It is an arithmetic number, because the mean of its divisors is an integer number (689871).

Almost surely, 2^26560989 is an apocalyptic number.

It is an amenable number.

26560989 is a deficient number, since it is larger than the sum of its proper divisors (23109723).

26560989 is a wasteful number, since it uses less digits than its factorization.

26560989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187 (or 177 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 26560989 is about 5153.7354414056. The cubic root of 26560989 is about 298.3651402962.

The spelling of 26560989 in words is "twenty-six million, five hundred sixty thousand, nine hundred eighty-nine".