25257487 has 4 divisors (see below), whose sum is σ = 25685640. Its totient is φ = 24829336.

The previous prime is 25257443. The next prime is 25257497. The reversal of 25257487 is 78475252.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25257487 is a prime.

It is a Smith number, since the sum of its digits (40) 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 (25257497) 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, 213988 + ... + 214105.

It is an arithmetic number, because the mean of its divisors is an integer number (6421410).

Almost surely, 2^25257487 is an apocalyptic number.

25257487 is a deficient number, since it is larger than the sum of its proper divisors (428153).

25257487 is an equidigital number, since it uses as much as digits as its factorization.

25257487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428152.

The product of its digits is 156800, while the sum is 40.

The square root of 25257487 is about 5025.6827396882. The cubic root of 25257487 is about 293.4022090618.

The spelling of 25257487 in words is "twenty-five million, two hundred fifty-seven thousand, four hundred eighty-seven".