26991145 has 8 divisors (see below), whose sum is σ = 32417280. Its totient is φ = 21574320.

The previous prime is 26991127. The next prime is 26991163. The reversal of 26991145 is 54119962.

It is an interprime number because it is at equal distance from previous prime (26991127) and next prime (26991163).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 26991145 - 2¹⁷ = 26860073 is a prime.

It is a super-2 number, since 2×26991145² = 1457043816822050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9990 + ... + 12400.

It is an arithmetic number, because the mean of its divisors is an integer number (4052160).

Almost surely, 2^26991145 is an apocalyptic number.

It is an amenable number.

26991145 is a deficient number, since it is larger than the sum of its proper divisors (5426135).

26991145 is a wasteful number, since it uses less digits than its factorization.

26991145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4655.

The product of its digits is 19440, while the sum is 37.

The square root of 26991145 is about 5195.3002800608. The cubic root of 26991145 is about 299.9672001177.

It can be divided in two parts, 2699 and 1145, that added together give a square (3844 = 62²).

The spelling of 26991145 in words is "twenty-six million, nine hundred ninety-one thousand, one hundred forty-five".