25280613 has 8 divisors (see below), whose sum is σ = 37452800. Its totient is φ = 16853724.

The previous prime is 25280599. The next prime is 25280639. The reversal of 25280613 is 31608252.

25280613 is a `hidden beast` number, since 25 + 28 + 0 + 613 = 666.

It is not a de Polignac number, because 25280613 - 2⁴ = 25280597 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 936319 = 25280613 / (2 + 5 + 2 + 8 + 0 + 6 + 1 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25280653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 468133 + ... + 468186.

It is an arithmetic number, because the mean of its divisors is an integer number (4681600).

Almost surely, 2^25280613 is an apocalyptic number.

It is an amenable number.

25280613 is a deficient number, since it is larger than the sum of its proper divisors (12172187).

25280613 is an equidigital number, since it uses as much as digits as its factorization.

25280613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 936328 (or 936322 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 25280613 is about 5027.9829951980. The cubic root of 25280613 is about 293.4917290480.

Adding to 25280613 its reverse (31608252), we get a palindrome (56888865).

The spelling of 25280613 in words is "twenty-five million, two hundred eighty thousand, six hundred thirteen".