26081640 has 96 divisors (see below), whose sum is σ = 91302120. Its totient is φ = 6418944.

The previous prime is 26081639. The next prime is 26081677. The reversal of 26081640 is 4618062.

26081640 is a `hidden beast` number, since 2 + 608 + 16 + 40 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 8892324 + 17189316 = 2982^2 + 4146^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1894 + ... + 7466.

Almost surely, 2^26081640 is an apocalyptic number.

26081640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26081640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45651060).

26081640 is an abundant number, since it is smaller than the sum of its proper divisors (65220480).

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

26081640 is a wasteful number, since it uses less digits than its factorization.

26081640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5603 (or 5596 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 26081640 is about 5107.0186997895. The cubic root of 26081640 is about 296.5593574495.

The spelling of 26081640 in words is "twenty-six million, eighty-one thousand, six hundred forty".