25331616 has 120 divisors (see below), whose sum is σ = 77297220. Its totient is φ = 8128512.

The previous prime is 25331599. The next prime is 25331627. The reversal of 25331616 is 61613352.

It can be written as a sum of positive squares in 2 ways, for example, as 25040016 + 291600 = 5004^2 + 540^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 25331616.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 75000 + ... + 75336.

Almost surely, 2^25331616 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 25331616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38648610).

25331616 is an abundant number, since it is smaller than the sum of its proper divisors (51965604).

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

25331616 is a wasteful number, since it uses less digits than its factorization.

25331616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388 (or 371 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 25331616 is about 5033.0523541883. The cubic root of 25331616 is about 293.6889671902.

Adding to 25331616 its reverse (61613352), we get a palindrome (86944968).

The spelling of 25331616 in words is "twenty-five million, three hundred thirty-one thousand, six hundred sixteen".