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25290 = 2325281

25290 has 24 divisors (see below), whose sum is σ = 65988. Its totient is φ = 6720.

The previous prime is 25261. The next prime is 25301. The reversal of 25290 is 9252.

It can be written as a sum of positive squares in 2 ways, for example, as 25281 + 9 = 159^2 + 3^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a nialpdrome in base 15.

It is a congruent number.

It is an unprimeable number.

25290 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 11 ways as a sum of consecutive naturals, for example, 51 + ... + 230.

225290 is an apocalyptic number.

25290 is an abundant number, since it is smaller than the sum of its proper divisors (40698).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32994).

25290 is a wasteful number, since it uses less digits than its factorization.

25290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294 (or 291 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 25290 is about 159.0282993684. The cubic root of 25290 is about 29.3528050239.

The spelling of 25290 in words is "twenty-five thousand, two hundred ninety".

Divisors: 1 2 3 5 6 9 10 15 18 30 45 90 281 562 843 1405 1686 2529 2810 4215 5058 8430 12645 25290