26643971 has 8 divisors (see below), whose sum is σ = 27371520. Its totient is φ = 25923208.

The previous prime is 26643949. The next prime is 26643979. The reversal of 26643971 is 17934662.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 26643971 - 2¹⁸ = 26381827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26643979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6830 + ... + 9996.

It is an arithmetic number, because the mean of its divisors is an integer number (3421440).

Almost surely, 2^26643971 is an apocalyptic number.

26643971 is a deficient number, since it is larger than the sum of its proper divisors (727549).

26643971 is a wasteful number, since it uses less digits than its factorization.

26643971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3393.

The product of its digits is 54432, while the sum is 38.

The square root of 26643971 is about 5161.7798287025. The cubic root of 26643971 is about 298.6755353236.

The spelling of 26643971 in words is "twenty-six million, six hundred forty-three thousand, nine hundred seventy-one".