25122816 has 144 divisors (see below), whose sum is σ = 76658400. Its totient is φ = 7913472.

The previous prime is 25122809. The next prime is 25122817. The reversal of 25122816 is 61822152.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (144).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 25122816.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25122817) 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 11 ways as a sum of consecutive naturals, for example, 534505 + ... + 534551.

It is an arithmetic number, because the mean of its divisors is an integer number (532350).

Almost surely, 2^25122816 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 25122816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38329200).

25122816 is an abundant number, since it is smaller than the sum of its proper divisors (51535584).

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

25122816 is a wasteful number, since it uses less digits than its factorization.

25122816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104 (or 81 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 25122816 is about 5012.2665531673. The cubic root of 25122816 is about 292.8798134117.

Adding to 25122816 its reverse (61822152), we get a palindrome (86944968).

The spelling of 25122816 in words is "twenty-five million, one hundred twenty-two thousand, eight hundred sixteen".