25865616 has 80 divisors (see below), whose sum is σ = 79709184. Its totient is φ = 7066752.

The previous prime is 25865611. The next prime is 25865617. The reversal of 25865616 is 61656852.

It is not an unprimeable number, because it can be changed into a prime (25865611) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 6055 + ... + 9401.

Almost surely, 2^25865616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25865616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39854592).

25865616 is an abundant number, since it is smaller than the sum of its proper divisors (53843568).

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

25865616 is a wasteful number, since it uses less digits than its factorization.

25865616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3388 (or 3382 counting only the distinct ones).

The product of its digits is 86400, while the sum is 39.

The square root of 25865616 is about 5085.8250068204. The cubic root of 25865616 is about 295.7383248612.

The spelling of 25865616 in words is "twenty-five million, eight hundred sixty-five thousand, six hundred sixteen".