25218720 has 144 divisors (see below), whose sum is σ = 87508512. Its totient is φ = 6612480.

The previous prime is 25218709. The next prime is 25218727. The reversal of 25218720 is 2781252.

It is a tau number, because it is divible by the number of its divisors (144).

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25218727) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 119415 + ... + 119625.

It is an arithmetic number, because the mean of its divisors is an integer number (607698).

Almost surely, 2^25218720 is an apocalyptic number.

25218720 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 25218720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43754256).

25218720 is an abundant number, since it is smaller than the sum of its proper divisors (62289792).

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

25218720 is a wasteful number, since it uses less digits than its factorization.

25218720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315 (or 304 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 25218720 is about 5021.8243696888. The cubic root of 25218720 is about 293.2520206209.

Adding to 25218720 its reverse (2781252), we get a palindrome (27999972).

The spelling of 25218720 in words is "twenty-five million, two hundred eighteen thousand, seven hundred twenty".