25306530 has 48 divisors (see below), whose sum is σ = 62161344. Its totient is φ = 6592320.

The previous prime is 25306529. The next prime is 25306549. The reversal of 25306530 is 3560352.

It is a self number, because there is not a number n which added to its sum of digits gives 25306530.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 232116 + ... + 232224.

It is an arithmetic number, because the mean of its divisors is an integer number (1295028).

Almost surely, 2^25306530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25306530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31080672).

25306530 is an abundant number, since it is smaller than the sum of its proper divisors (36854814).

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

25306530 is a wasteful number, since it uses less digits than its factorization.

25306530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299 (or 190 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 24.

The square root of 25306530 is about 5030.5596110174. The cubic root of 25306530 is about 293.5919880531.

Adding to 25306530 its reverse (3560352), we get a palindrome (28866882).

The spelling of 25306530 in words is "twenty-five million, three hundred six thousand, five hundred thirty".