25305500 has 96 divisors (see below), whose sum is σ = 62270208. Its totient is φ = 8904000.

The previous prime is 25305481. The next prime is 25305509. The reversal of 25305500 is 550352.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25305509) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 236447 + ... + 236553.

It is an arithmetic number, because the mean of its divisors is an integer number (648648).

Almost surely, 2^25305500 is an apocalyptic number.

25305500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25305500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31135104).

25305500 is an abundant number, since it is smaller than the sum of its proper divisors (36964708).

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

25305500 is a wasteful number, since it uses less digits than its factorization.

25305500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180 (or 168 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 20.

The square root of 25305500 is about 5030.4572356795. The cubic root of 25305500 is about 293.5880048407.

Adding to 25305500 its reverse (550352), we get a palindrome (25855852).

The spelling of 25305500 in words is "twenty-five million, three hundred five thousand, five hundred".