26540669 has 4 divisors (see below), whose sum is σ = 26560320. Its totient is φ = 26521020.

The previous prime is 26540659. The next prime is 26540677. The reversal of 26540669 is 96604562.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 96604562 = 2 ⋅48302281.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26540669 is a prime.

It is a super-2 number, since 2×26540669² = 1408814221935122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26540609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7637 + ... + 10554.

It is an arithmetic number, because the mean of its divisors is an integer number (6640080).

Almost surely, 2^26540669 is an apocalyptic number.

It is an amenable number.

26540669 is a deficient number, since it is larger than the sum of its proper divisors (19651).

26540669 is a wasteful number, since it uses less digits than its factorization.

26540669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19650.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 26540669 is about 5151.7636785862. The cubic root of 26540669 is about 298.2890346163.

The spelling of 26540669 in words is "twenty-six million, five hundred forty thousand, six hundred sixty-nine".