26642689 has 16 divisors (see below), whose sum is σ = 29082240. Its totient is φ = 24313600.

The previous prime is 26642683. The next prime is 26642719. The reversal of 26642689 is 98624662.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26642689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (26642683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101172 + ... + 101434.

It is an arithmetic number, because the mean of its divisors is an integer number (1817640).

Almost surely, 2^26642689 is an apocalyptic number.

It is an amenable number.

26642689 is a deficient number, since it is larger than the sum of its proper divisors (2439551).

26642689 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (26642688) it forms an eRAP, since the sums of their prime factors are consecutive (439 and 440).

26642689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440.

The product of its digits is 248832, while the sum is 43.

The square root of 26642689 is about 5161.6556452363. The cubic root of 26642689 is about 298.6707448943.

The spelling of 26642689 in words is "twenty-six million, six hundred forty-two thousand, six hundred eighty-nine".