25703609 has 4 divisors (see below), whose sum is σ = 27215604. Its totient is φ = 24191616.

The previous prime is 25703549. The next prime is 25703651. The reversal of 25703609 is 90630752.

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 10061584 + 15642025 = 3172^2 + 3955^2 .

It is a cyclic number.

It is not a de Polignac number, because 25703609 - 2¹⁶ = 25638073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25703669) by changing a digit.

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, 755972 + ... + 756005.

It is an arithmetic number, because the mean of its divisors is an integer number (6803901).

Almost surely, 2^25703609 is an apocalyptic number.

It is an amenable number.

25703609 is a deficient number, since it is larger than the sum of its proper divisors (1511995).

25703609 is a wasteful number, since it uses less digits than its factorization.

25703609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1511994.

The product of its (nonzero) digits is 11340, while the sum is 32.

The square root of 25703609 is about 5069.8726808471. The cubic root of 25703609 is about 295.1195876347.

The spelling of 25703609 in words is "twenty-five million, seven hundred three thousand, six hundred nine".