25605247 has 4 divisors (see below), whose sum is σ = 27111456. Its totient is φ = 24099040.

The previous prime is 25605241. The next prime is 25605259. The reversal of 25605247 is 74250652.

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 25605247 - 2⁷ = 25605119 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 a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25605241) 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, 753079 + ... + 753112.

It is an arithmetic number, because the mean of its divisors is an integer number (6777864).

Almost surely, 2^25605247 is an apocalyptic number.

25605247 is a deficient number, since it is larger than the sum of its proper divisors (1506209).

25605247 is a wasteful number, since it uses less digits than its factorization.

25605247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1506208.

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 25605247 is about 5060.1627444184. The cubic root of 25605247 is about 294.7426540504.

Adding to 25605247 its reverse (74250652), we get a palindrome (99855899).

It can be divided in two parts, 25605 and 247, that added together give a palindrome (25852).

The spelling of 25605247 in words is "twenty-five million, six hundred five thousand, two hundred forty-seven".