26805840 has 80 divisors (see below), whose sum is σ = 84506496. Its totient is φ = 7027200.

The previous prime is 26805811. The next prime is 26805851. The reversal of 26805840 is 4850862.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13725 + ... + 15555.

Almost surely, 2^26805840 is an apocalyptic number.

26805840 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 26805840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42253248).

26805840 is an abundant number, since it is smaller than the sum of its proper divisors (57700656).

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

26805840 is a wasteful number, since it uses less digits than its factorization.

26805840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1908 (or 1902 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 26805840 is about 5177.4356587021. The cubic root of 26805840 is about 299.2791582333.

The spelling of 26805840 in words is "twenty-six million, eight hundred five thousand, eight hundred forty".