26856240 has 80 divisors (see below), whose sum is σ = 83753568. Its totient is φ = 7118848.

The previous prime is 26856239. The next prime is 26856257. The reversal of 26856240 is 4265862.

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

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, 75904 + ... + 76256.

Almost surely, 2^26856240 is an apocalyptic number.

26856240 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 26856240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41876784).

26856240 is an abundant number, since it is smaller than the sum of its proper divisors (56897328).

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

26856240 is a wasteful number, since it uses less digits than its factorization.

26856240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 686 (or 680 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 26856240 is about 5182.3006473959. The cubic root of 26856240 is about 299.4666077600.

The spelling of 26856240 in words is "twenty-six million, eight hundred fifty-six thousand, two hundred forty".