25918280 has 64 divisors (see below), whose sum is σ = 62424000. Its totient is φ = 9656064.

The previous prime is 25918259. The next prime is 25918283. The reversal of 25918280 is 8281952.

It is a Cunningham number, because it is equal to 5091²-1.

It is a self number, because there is not a number n which added to its sum of digits gives 25918280.

It is not an unprimeable number, because it can be changed into a prime (25918283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50666 + ... + 51174.

It is an arithmetic number, because the mean of its divisors is an integer number (975375).

Almost surely, 2^25918280 is an apocalyptic number.

25918280 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 25918280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31212000).

25918280 is an abundant number, since it is smaller than the sum of its proper divisors (36505720).

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

25918280 is a wasteful number, since it uses less digits than its factorization.

25918280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606 (or 602 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 25918280 is about 5090.9999017875. Note that the first 4 decimals coincide. The cubic root of 25918280 is about 295.9389026564.

The spelling of 25918280 in words is "twenty-five million, nine hundred eighteen thousand, two hundred eighty".