25218180 has 108 divisors (see below), whose sum is σ = 82931940. Its totient is φ = 6200064.

The previous prime is 25218173. The next prime is 25218181. The reversal of 25218180 is 8181252.

It can be written as a sum of positive squares in 6 ways, for example, as 4260096 + 20958084 = 2064^2 + 4578^2 .

It is not an unprimeable number, because it can be changed into a prime (25218181) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 30006 + ... + 30834.

Almost surely, 2^25218180 is an apocalyptic number.

25218180 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 25218180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41465970).

25218180 is an abundant number, since it is smaller than the sum of its proper divisors (57713760).

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

25218180 is a wasteful number, since it uses less digits than its factorization.

25218180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870 (or 852 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 25218180 is about 5021.7706040798. The cubic root of 25218180 is about 293.2499275035.

It can be divided in two parts, 2521 and 8180, that added together give a palindrome (10701).

The spelling of 25218180 in words is "twenty-five million, two hundred eighteen thousand, one hundred eighty".