25603257 has 4 divisors (see below), whose sum is σ = 34137680. Its totient is φ = 17068836.

The previous prime is 25603243. The next prime is 25603261. The reversal of 25603257 is 75230652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-25603257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25603157) by changing a digit.

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, 4267207 + ... + 4267212.

It is an arithmetic number, because the mean of its divisors is an integer number (8534420).

Almost surely, 2^25603257 is an apocalyptic number.

It is an amenable number.

25603257 is a deficient number, since it is larger than the sum of its proper divisors (8534423).

25603257 is an equidigital number, since it uses as much as digits as its factorization.

25603257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8534422.

The product of its (nonzero) digits is 12600, while the sum is 30.

The square root of 25603257 is about 5059.9661066059. The cubic root of 25603257 is about 294.7350182056.

The spelling of 25603257 in words is "twenty-five million, six hundred three thousand, two hundred fifty-seven".