26691023 has 4 divisors (see below), whose sum is σ = 27412440. Its totient is φ = 25969608.

The previous prime is 26691013. The next prime is 26691047. The reversal of 26691023 is 32019662.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32019662 = 2 ⋅16009831.

It is a cyclic number.

It is not a de Polignac number, because 26691023 - 2⁸ = 26690767 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 (26691013) 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, 360653 + ... + 360726.

It is an arithmetic number, because the mean of its divisors is an integer number (6853110).

Almost surely, 2^26691023 is an apocalyptic number.

26691023 is a deficient number, since it is larger than the sum of its proper divisors (721417).

26691023 is an equidigital number, since it uses as much as digits as its factorization.

26691023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721416.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 26691023 is about 5166.3355485295. The cubic root of 26691023 is about 298.8512475816.

The spelling of 26691023 in words is "twenty-six million, six hundred ninety-one thousand, twenty-three".