26991944 has 48 divisors (see below), whose sum is σ = 60496380. Its totient is φ = 11249280.

The previous prime is 26991941. The next prime is 26991967. The reversal of 26991944 is 44919962.

It can be written as a sum of positive squares in 2 ways, for example, as 26399044 + 592900 = 5138^2 + 770^2 .

It is a junction number, because it is equal to n+sod(n) for n = 26991895 and 26991904.

It is not an unprimeable number, because it can be changed into a prime (26991941) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13574 + ... + 15434.

Almost surely, 2^26991944 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 26991944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30248190).

26991944 is an abundant number, since it is smaller than the sum of its proper divisors (33504436).

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

26991944 is a wasteful number, since it uses less digits than its factorization.

26991944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1918 (or 1907 counting only the distinct ones).

The product of its digits is 139968, while the sum is 44.

The square root of 26991944 is about 5195.3771759132. The cubic root of 26991944 is about 299.9701599950.

The spelling of 26991944 in words is "twenty-six million, nine hundred ninety-one thousand, nine hundred forty-four".