26997647 has 4 divisors (see below), whose sum is σ = 27098280. Its totient is φ = 26897016.

The previous prime is 26997643. The next prime is 26997667. The reversal of 26997647 is 74679962.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 26997647 - 2² = 26997643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 26997595 and 26997604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26997643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49913 + ... + 50450.

It is an arithmetic number, because the mean of its divisors is an integer number (6774570).

Almost surely, 2^26997647 is an apocalyptic number.

26997647 is a deficient number, since it is larger than the sum of its proper divisors (100633).

26997647 is a wasteful number, since it uses less digits than its factorization.

26997647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100632.

The product of its digits is 1143072, while the sum is 50.

The square root of 26997647 is about 5195.9260002429. The cubic root of 26997647 is about 299.9912849320.

The spelling of 26997647 in words is "twenty-six million, nine hundred ninety-seven thousand, six hundred forty-seven".