25545520 has 240 divisors, whose sum is σ = 83119680. Its totient is φ = 7096320.

The previous prime is 25545517. The next prime is 25545539. The reversal of 25545520 is 2554552.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 880866 + ... + 880894.

It is an arithmetic number, because the mean of its divisors is an integer number (346332).

Almost surely, 2^25545520 is an apocalyptic number.

25545520 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 25545520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41559840).

25545520 is an abundant number, since it is smaller than the sum of its proper divisors (57574160).

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

25545520 is a wasteful number, since it uses less digits than its factorization.

25545520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84 (or 67 counting only the distinct ones).

The product of its (nonzero) digits is 10000, while the sum is 28.

The square root of 25545520 is about 5054.2576111631. The cubic root of 25545520 is about 294.5133026199.

It can be divided in two parts, 25 and 545520, that added together give a palindrome (545545).

The spelling of 25545520 in words is "twenty-five million, five hundred forty-five thousand, five hundred twenty".