25509330 has 160 divisors (see below), whose sum is σ = 85726080. Its totient is φ = 5287680.

The previous prime is 25509313. The next prime is 25509349. The reversal of 25509330 is 3390552.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 25509294 and 25509303.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 62166 + ... + 62574.

It is an arithmetic number, because the mean of its divisors is an integer number (535788).

Almost surely, 2^25509330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25509330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42863040).

25509330 is an abundant number, since it is smaller than the sum of its proper divisors (60216750).

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

25509330 is a wasteful number, since it uses less digits than its factorization.

25509330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446 (or 437 counting only the distinct ones).

The product of its (nonzero) digits is 4050, while the sum is 27.

The square root of 25509330 is about 5050.6761923529. The cubic root of 25509330 is about 294.3741591927.

Adding to 25509330 its reverse (3390552), we get a palindrome (28899882).

The spelling of 25509330 in words is "twenty-five million, five hundred nine thousand, three hundred thirty".