25865216 has 88 divisors (see below), whose sum is σ = 58462320. Its totient is φ = 11354112.

The previous prime is 25865209. The next prime is 25865263. The reversal of 25865216 is 61256852.

25865216 = 254² + 255² + ... + 454².

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, 386015 + ... + 386081.

Almost surely, 2^25865216 is an apocalyptic number.

25865216 is a gapful number since it is divisible by the number (26) 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 25865216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29231160).

25865216 is an abundant number, since it is smaller than the sum of its proper divisors (32597104).

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

25865216 is a wasteful number, since it uses less digits than its factorization.

25865216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129 (or 111 counting only the distinct ones).

The product of its digits is 28800, while the sum is 35.

The square root of 25865216 is about 5085.7856816818. The cubic root of 25865216 is about 295.7368003671.

The spelling of 25865216 in words is "twenty-five million, eight hundred sixty-five thousand, two hundred sixteen".