26689986 has 40 divisors (see below), whose sum is σ = 60722640. Its totient is φ = 8760312.

The previous prime is 26689969. The next prime is 26689991. The reversal of 26689986 is 68998662.

It is a Harshad number since it is a multiple of its sum of digits (54).

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 19 ways as a sum of consecutive naturals, for example, 9625 + ... + 12083.

It is an arithmetic number, because the mean of its divisors is an integer number (1518066).

Almost surely, 2^26689986 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26689986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30361320).

26689986 is an abundant number, since it is smaller than the sum of its proper divisors (34032654).

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

26689986 is a wasteful number, since it uses less digits than its factorization.

26689986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2540 (or 2531 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 54.

The square root of 26689986 is about 5166.2351862841. The cubic root of 26689986 is about 298.8473772072.

The spelling of 26689986 in words is "twenty-six million, six hundred eighty-nine thousand, nine hundred eighty-six".