25445643 has 4 divisors (see below), whose sum is σ = 33927528. Its totient is φ = 16963760.

The previous prime is 25445633. The next prime is 25445647. The reversal of 25445643 is 34654452.

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 25445643 - 2¹⁰ = 25444619 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25445647) 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, 4240938 + ... + 4240943.

It is an arithmetic number, because the mean of its divisors is an integer number (8481882).

Almost surely, 2^25445643 is an apocalyptic number.

25445643 is a deficient number, since it is larger than the sum of its proper divisors (8481885).

25445643 is an equidigital number, since it uses as much as digits as its factorization.

25445643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8481884.

The product of its digits is 57600, while the sum is 33.

The square root of 25445643 is about 5044.3674529122. The cubic root of 25445643 is about 294.1289752962.

The spelling of 25445643 in words is "twenty-five million, four hundred forty-five thousand, six hundred forty-three".