26905866 has 64 divisors (see below), whose sum is σ = 62270208. Its totient is φ = 7676928.

The previous prime is 26905859. The next prime is 26905877. The reversal of 26905866 is 66850962.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 136480 + ... + 136676.

It is an arithmetic number, because the mean of its divisors is an integer number (972972).

Almost surely, 2^26905866 is an apocalyptic number.

26905866 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 26905866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31135104).

26905866 is an abundant number, since it is smaller than the sum of its proper divisors (35364342).

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

26905866 is a wasteful number, since it uses less digits than its factorization.

26905866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335.

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

The square root of 26905866 is about 5187.0864654447. The cubic root of 26905866 is about 299.6509495924.

The spelling of 26905866 in words is "twenty-six million, nine hundred five thousand, eight hundred sixty-six".