26991228 has 72 divisors (see below), whose sum is σ = 71724240. Its totient is φ = 7884800.

The previous prime is 26991227. The next prime is 26991233. The reversal of 26991228 is 82219962.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26991227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41788 + ... + 42428.

It is an arithmetic number, because the mean of its divisors is an integer number (996170).

Almost surely, 2^26991228 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26991228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35862120).

26991228 is an abundant number, since it is smaller than the sum of its proper divisors (44733012).

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

26991228 is a wasteful number, since it uses less digits than its factorization.

26991228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 699 (or 686 counting only the distinct ones).

The product of its digits is 31104, while the sum is 39.

The square root of 26991228 is about 5195.3082680434. The cubic root of 26991228 is about 299.9675075920.

The spelling of 26991228 in words is "twenty-six million, nine hundred ninety-one thousand, two hundred twenty-eight".