25312645 has 4 divisors (see below), whose sum is σ = 30375180. Its totient is φ = 20250112.

The previous prime is 25312613. The next prime is 25312687. The reversal of 25312645 is 54621352.

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 19368801 + 5943844 = 4401^2 + 2438^2 .

It is a cyclic number.

It is not a de Polignac number, because 25312645 - 2⁵ = 25312613 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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2531260 + ... + 2531269.

It is an arithmetic number, because the mean of its divisors is an integer number (7593795).

Almost surely, 2^25312645 is an apocalyptic number.

It is an amenable number.

25312645 is a deficient number, since it is larger than the sum of its proper divisors (5062535).

25312645 is an equidigital number, since it uses as much as digits as its factorization.

25312645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5062534.

The product of its digits is 7200, while the sum is 28.

The square root of 25312645 is about 5031.1673595697. The cubic root of 25312645 is about 293.6156337343.

Adding to 25312645 its reverse (54621352), we get a palindrome (79933997).

It can be divided in two parts, 253 and 12645, that multiplied together give a triangular number (3199185 = T₂₅₂₉).

The spelling of 25312645 in words is "twenty-five million, three hundred twelve thousand, six hundred forty-five".