26564197 has 4 divisors (see below), whose sum is σ = 28979136. Its totient is φ = 24149260.

The previous prime is 26564191. The next prime is 26564207. The reversal of 26564197 is 79146562.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26564197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26564191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1207453 + ... + 1207474.

It is an arithmetic number, because the mean of its divisors is an integer number (7244784).

Almost surely, 2^26564197 is an apocalyptic number.

It is an amenable number.

26564197 is a deficient number, since it is larger than the sum of its proper divisors (2414939).

26564197 is a wasteful number, since it uses less digits than its factorization.

26564197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2414938.

The product of its digits is 90720, while the sum is 40.

The square root of 26564197 is about 5154.0466625750. The cubic root of 26564197 is about 298.3771518574.

The spelling of 26564197 in words is "twenty-six million, five hundred sixty-four thousand, one hundred ninety-seven".