26689897 has 4 divisors (see below), whose sum is σ = 28742980. Its totient is φ = 24636816.

The previous prime is 26689829. The next prime is 26689903. The reversal of 26689897 is 79898662.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79898662 = 2 ⋅39949331.

It can be written as a sum of positive squares in 2 ways, for example, as 10214416 + 16475481 = 3196^2 + 4059^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26689897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26689297) 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, 1026522 + ... + 1026547.

It is an arithmetic number, because the mean of its divisors is an integer number (7185745).

Almost surely, 2^26689897 is an apocalyptic number.

It is an amenable number.

26689897 is a deficient number, since it is larger than the sum of its proper divisors (2053083).

26689897 is a wasteful number, since it uses less digits than its factorization.

26689897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2053082.

The product of its digits is 2612736, while the sum is 55.

The square root of 26689897 is about 5166.2265726544. The cubic root of 26689897 is about 298.8470450296.

The spelling of 26689897 in words is "twenty-six million, six hundred eighty-nine thousand, eight hundred ninety-seven".