25642445 has 4 divisors (see below), whose sum is σ = 30770940. Its totient is φ = 20513952.

The previous prime is 25642439. The next prime is 25642459. The reversal of 25642445 is 54424652.

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

It can be written as a sum of positive squares in 2 ways, for example, as 17197609 + 8444836 = 4147^2 + 2906^2 .

It is a cyclic number.

It is not a de Polignac number, because 25642445 - 2¹⁴ = 25626061 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2564240 + ... + 2564249.

It is an arithmetic number, because the mean of its divisors is an integer number (7692735).

Almost surely, 2^25642445 is an apocalyptic number.

It is an amenable number.

25642445 is a deficient number, since it is larger than the sum of its proper divisors (5128495).

25642445 is an equidigital number, since it uses as much as digits as its factorization.

25642445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5128494.

The product of its digits is 38400, while the sum is 32.

The square root of 25642445 is about 5063.8369839480. The cubic root of 25642445 is about 294.8853140332.

The spelling of 25642445 in words is "twenty-five million, six hundred forty-two thousand, four hundred forty-five".