25605520 has 40 divisors (see below), whose sum is σ = 60141240. Its totient is φ = 10137600.

The previous prime is 25605497. The next prime is 25605533. The reversal of 25605520 is 2550652.

It can be written as a sum of positive squares in 4 ways, for example, as 12988816 + 12616704 = 3604^2 + 3552^2 .

It is a tau number, because it is divible by the number of its divisors (40).

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 7 ways as a sum of consecutive naturals, for example, 6496 + ... + 9664.

It is an arithmetic number, because the mean of its divisors is an integer number (1503531).

Almost surely, 2^25605520 is an apocalyptic number.

25605520 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 25605520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30070620).

25605520 is an abundant number, since it is smaller than the sum of its proper divisors (34535720).

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

25605520 is a wasteful number, since it uses less digits than its factorization.

25605520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3283 (or 3277 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 25605520 is about 5060.1897197635. The cubic root of 25605520 is about 294.7437015500.

The spelling of 25605520 in words is "twenty-five million, six hundred five thousand, five hundred twenty".