25724245 has 4 divisors (see below), whose sum is σ = 30869100. Its totient is φ = 20579392.

The previous prime is 25724227. The next prime is 25724267. The reversal of 25724245 is 54242752.

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 18722929 + 7001316 = 4327^2 + 2646^2 .

It is a cyclic number.

It is not a de Polignac number, because 25724245 - 2¹¹ = 25722197 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2572420 + ... + 2572429.

It is an arithmetic number, because the mean of its divisors is an integer number (7717275).

Almost surely, 2^25724245 is an apocalyptic number.

It is an amenable number.

25724245 is a deficient number, since it is larger than the sum of its proper divisors (5144855).

25724245 is an equidigital number, since it uses as much as digits as its factorization.

25724245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5144854.

The product of its digits is 22400, while the sum is 31.

The square root of 25724245 is about 5071.9074321206. The cubic root of 25724245 is about 295.1985448833.

Adding to 25724245 its reverse (54242752), we get a palindrome (79966997).

The spelling of 25724245 in words is "twenty-five million, seven hundred twenty-four thousand, two hundred forty-five".