25724585 has 4 divisors (see below), whose sum is σ = 30869508. Its totient is φ = 20579664.

The previous prime is 25724549. The next prime is 25724593. The reversal of 25724585 is 58542752.

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 3474496 + 22250089 = 1864^2 + 4717^2 .

It is a cyclic number.

It is not a de Polignac number, because 25724585 - 2¹⁰ = 25723561 is a prime.

It is a Duffinian number.

It is a Curzon number.

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, 2572454 + ... + 2572463.

It is an arithmetic number, because the mean of its divisors is an integer number (7717377).

Almost surely, 2^25724585 is an apocalyptic number.

It is an amenable number.

25724585 is a deficient number, since it is larger than the sum of its proper divisors (5144923).

25724585 is an equidigital number, since it uses as much as digits as its factorization.

25724585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5144922.

The product of its digits is 112000, while the sum is 38.

The square root of 25724585 is about 5071.9409499717. The cubic root of 25724585 is about 295.1998454341.

It can be divided in two parts, 257 and 24585, that added together give a palindrome (24842).

The spelling of 25724585 in words is "twenty-five million, seven hundred twenty-four thousand, five hundred eighty-five".