25115616 has 96 divisors (see below), whose sum is σ = 75146400. Its totient is φ = 8156160.

The previous prime is 25115603. The next prime is 25115633. The reversal of 25115616 is 61651152.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

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 25115616.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35070 + ... + 35778.

It is an arithmetic number, because the mean of its divisors is an integer number (782775).

Almost surely, 2^25115616 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 25115616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37573200).

25115616 is an abundant number, since it is smaller than the sum of its proper divisors (50030784).

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

25115616 is a wasteful number, since it uses less digits than its factorization.

25115616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 769 (or 755 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 25115616 is about 5011.5482637604. The cubic root of 25115616 is about 292.8518317271.

Adding to 25115616 its reverse (61651152), we get a palindrome (86766768).

The spelling of 25115616 in words is "twenty-five million, one hundred fifteen thousand, six hundred sixteen".