25205500 has 24 divisors (see below), whose sum is σ = 55049904. Its totient is φ = 10082000.

The previous prime is 25205491. The next prime is 25205501. The reversal of 25205500 is 550252.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25205501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24706 + ... + 25705.

It is an arithmetic number, because the mean of its divisors is an integer number (2293746).

Almost surely, 2^25205500 is an apocalyptic number.

25205500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25205500 is an abundant number, since it is smaller than the sum of its proper divisors (29844404).

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

25205500 is a wasteful number, since it uses less digits than its factorization.

25205500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50430 (or 50418 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 19.

The square root of 25205500 is about 5020.5079424297. The cubic root of 25205500 is about 293.2007694163.

Adding to 25205500 its reverse (550252), we get a palindrome (25755752).

It can be divided in two parts, 25205 and 500, that multiplied together give a square (12602500 = 3550²).

The spelling of 25205500 in words is "twenty-five million, two hundred five thousand, five hundred".