25005500 has 48 divisors (see below), whose sum is σ = 58828224. Its totient is φ = 9230400.

The previous prime is 25005473. The next prime is 25005509. The reversal of 25005500 is 550052.

It is a happy number.

25005500 is a modest number, since divided by 5500 gives 2500 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25005509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4577 + ... + 8423.

It is an arithmetic number, because the mean of its divisors is an integer number (1225588).

Almost surely, 2^25005500 is an apocalyptic number.

25005500 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 25005500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29414112).

25005500 is an abundant number, since it is smaller than the sum of its proper divisors (33822724).

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

25005500 is a wasteful number, since it uses less digits than its factorization.

25005500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3879 (or 3867 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 17.

The square root of 25005500 is about 5000.5499697533. The cubic root of 25005500 is about 292.4232150458.

Adding to 25005500 its reverse (550052), we get a palindrome (25555552).

It can be divided in two parts, 25005 and 500, that multiplied together give a triangular number (12502500 = T₅₀₀₀).

The spelling of 25005500 in words is "twenty-five million, five thousand, five hundred".