26690647 has 4 divisors (see below), whose sum is σ = 26810560. Its totient is φ = 26570736.

The previous prime is 26690639. The next prime is 26690681. The reversal of 26690647 is 74609662.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74609662 = 2 ⋅37304831.

It is a cyclic number.

It is not a de Polignac number, because 26690647 - 2³ = 26690639 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 (26690047) 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, 59622 + ... + 60067.

It is an arithmetic number, because the mean of its divisors is an integer number (6702640).

Almost surely, 2^26690647 is an apocalyptic number.

26690647 is a deficient number, since it is larger than the sum of its proper divisors (119913).

26690647 is a wasteful number, since it uses less digits than its factorization.

26690647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119912.

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 26690647 is about 5166.2991589725. The cubic root of 26690647 is about 298.8498442559.

The spelling of 26690647 in words is "twenty-six million, six hundred ninety thousand, six hundred forty-seven".