26919891 has 32 divisors (see below), whose sum is σ = 42577920. Its totient is φ = 16751232.

The previous prime is 26919889. The next prime is 26919901. The reversal of 26919891 is 19891962.

It is not a de Polignac number, because 26919891 - 2¹ = 26919889 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26919881) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 102226 + ... + 102488.

It is an arithmetic number, because the mean of its divisors is an integer number (1330560).

Almost surely, 2^26919891 is an apocalyptic number.

26919891 is a deficient number, since it is larger than the sum of its proper divisors (15658029).

26919891 is a wasteful number, since it uses less digits than its factorization.

26919891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512 (or 506 counting only the distinct ones).

The product of its digits is 69984, while the sum is 45.

The square root of 26919891 is about 5188.4382043154. The cubic root of 26919891 is about 299.7030060791.

The spelling of 26919891 in words is "twenty-six million, nine hundred nineteen thousand, eight hundred ninety-one".