26287643 has 4 divisors (see below), whose sum is σ = 27430608. Its totient is φ = 25144680.

The previous prime is 26287619. The next prime is 26287669. The reversal of 26287643 is 34678262.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 26287643 - 2¹⁰ = 26286619 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 26287597 and 26287606.

It is not an unprimeable number, because it can be changed into a prime (26287673) 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, 571448 + ... + 571493.

It is an arithmetic number, because the mean of its divisors is an integer number (6857652).

Almost surely, 2^26287643 is an apocalyptic number.

26287643 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

26287643 is a deficient number, since it is larger than the sum of its proper divisors (1142965).

26287643 is a wasteful number, since it uses less digits than its factorization.

26287643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1142964.

The product of its digits is 96768, while the sum is 38.

The square root of 26287643 is about 5127.1476475717. The cubic root of 26287643 is about 297.3380914075.

The spelling of 26287643 in words is "twenty-six million, two hundred eighty-seven thousand, six hundred forty-three".