26638643 has 8 divisors (see below), whose sum is σ = 28894320. Its totient is φ = 24459520.

The previous prime is 26638637. The next prime is 26638663. The reversal of 26638643 is 34683662.

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 26638643 - 2⁸ = 26638387 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 26638597 and 26638606.

It is not an unprimeable number, because it can be changed into a prime (26638603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18413 + ... + 19806.

It is an arithmetic number, because the mean of its divisors is an integer number (3611790).

Almost surely, 2^26638643 is an apocalyptic number.

26638643 is a deficient number, since it is larger than the sum of its proper divisors (2255677).

26638643 is a wasteful number, since it uses less digits than its factorization.

26638643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38277.

The product of its digits is 124416, while the sum is 38.

The square root of 26638643 is about 5161.2637018467. The cubic root of 26638643 is about 298.6556252617.

The spelling of 26638643 in words is "twenty-six million, six hundred thirty-eight thousand, six hundred forty-three".