25801216 has 80 divisors (see below), whose sum is σ = 61674624. Its totient is φ = 10543104.

The previous prime is 25801199. The next prime is 25801253. The reversal of 25801216 is 61210852.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82276 + ... + 82588.

Almost surely, 2^25801216 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 25801216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30837312).

25801216 is an abundant number, since it is smaller than the sum of its proper divisors (35873408).

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

25801216 is an equidigital number, since it uses as much as digits as its factorization.

25801216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361 (or 345 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 25801216 is about 5079.4897381528. The cubic root of 25801216 is about 295.4926785882.

The spelling of 25801216 in words is "twenty-five million, eight hundred one thousand, two hundred sixteen".