25809030 has 192 divisors, whose sum is σ = 80720640. Its totient is φ = 5878656.

The previous prime is 25809029. The next prime is 25809037. The reversal of 25809030 is 3090852.

It is a super-2 number, since 2×25809030² = 1332212059081800, which contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 25808985 and 25809003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25809037) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 600189 + ... + 600231.

It is an arithmetic number, because the mean of its divisors is an integer number (420420).

Almost surely, 2^25809030 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25809030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40360320).

25809030 is an abundant number, since it is smaller than the sum of its proper divisors (54911610).

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

25809030 is a wasteful number, since it uses less digits than its factorization.

25809030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97 (or 85 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 25809030 is about 5080.2588516728. The cubic root of 25809030 is about 295.5225059516.

Adding to 25809030 its reverse (3090852), we get a palindrome (28899882).

The spelling of 25809030 in words is "twenty-five million, eight hundred nine thousand, thirty".