25285 has 8 divisors (see below), whose sum is σ = 32760. Its totient is φ = 18624.

The previous prime is 25261. The next prime is 25301. The reversal of 25285 is 58252.

It can be written as a sum of positive squares in 4 ways, for example, as 4 + 25281 = 2^2 + 159^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25285 - 2⁵ = 25253 is a prime.

25285 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130 + ... + 259.

It is an arithmetic number, because the mean of its divisors is an integer number (4095).

2²⁵²⁸⁵ is an apocalyptic number.

25285 is the 130-th pentagonal number.

It is an amenable number.

25285 is a deficient number, since it is larger than the sum of its proper divisors (7475).

25285 is a wasteful number, since it uses less digits than its factorization.

25285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407.

The product of its digits is 800, while the sum is 22.

The square root of 25285 is about 159.0125781188. The cubic root of 25285 is about 29.3508704820.

The spelling of 25285 in words is "twenty-five thousand, two hundred eighty-five".