25326643 has 4 divisors (see below), whose sum is σ = 25944408. Its totient is φ = 24708880.

The previous prime is 25326607. The next prime is 25326649. The reversal of 25326643 is 34662352.

It is a happy number.

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 25326643 - 2⁹ = 25326131 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25326649) 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 3 ways as a sum of consecutive naturals, for example, 308821 + ... + 308902.

It is an arithmetic number, because the mean of its divisors is an integer number (6486102).

Almost surely, 2^25326643 is an apocalyptic number.

25326643 is a deficient number, since it is larger than the sum of its proper divisors (617765).

25326643 is an equidigital number, since it uses as much as digits as its factorization.

25326643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617764.

The product of its digits is 25920, while the sum is 31.

The square root of 25326643 is about 5032.5582957379. The cubic root of 25326643 is about 293.6697473239.

Adding to 25326643 its reverse (34662352), we get a palindrome (59988995).

It can be divided in two parts, 253 and 26643, that added together give a square (26896 = 164²).

The spelling of 25326643 in words is "twenty-five million, three hundred twenty-six thousand, six hundred forty-three".