26856690 has 128 divisors (see below), whose sum is σ = 79626240. Its totient is φ = 5660928.

The previous prime is 26856689. The next prime is 26856733. The reversal of 26856690 is 9665862.

It is a super-2 number, since 2×26856690² = 1442563595512200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 211407 + ... + 211533.

It is an arithmetic number, because the mean of its divisors is an integer number (622080).

Almost surely, 2^26856690 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26856690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39813120).

26856690 is an abundant number, since it is smaller than the sum of its proper divisors (52769550).

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

26856690 is a wasteful number, since it uses less digits than its factorization.

26856690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216.

The product of its (nonzero) digits is 155520, while the sum is 42.

The square root of 26856690 is about 5182.3440642242. The cubic root of 26856690 is about 299.4682803598.

The spelling of 26856690 in words is "twenty-six million, eight hundred fifty-six thousand, six hundred ninety".