25687345 has 4 divisors (see below), whose sum is σ = 30824820. Its totient is φ = 20549872.

The previous prime is 25687309. The next prime is 25687367. The reversal of 25687345 is 54378652.

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 15492096 + 10195249 = 3936^2 + 3193^2 .

It is a cyclic number.

It is not a de Polignac number, because 25687345 - 2⁷ = 25687217 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 junction number, because it is equal to n+sod(n) for n = 25687298 and 25687307.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2568730 + ... + 2568739.

It is an arithmetic number, because the mean of its divisors is an integer number (7706205).

Almost surely, 2^25687345 is an apocalyptic number.

It is an amenable number.

25687345 is a deficient number, since it is larger than the sum of its proper divisors (5137475).

25687345 is an equidigital number, since it uses as much as digits as its factorization.

25687345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5137474.

The product of its digits is 201600, while the sum is 40.

The square root of 25687345 is about 5068.2684419829. The cubic root of 25687345 is about 295.0573287032.

The spelling of 25687345 in words is "twenty-five million, six hundred eighty-seven thousand, three hundred forty-five".