25511616 has 84 divisors (see below), whose sum is σ = 78772512. Its totient is φ = 7847424.

The previous prime is 25511609. The next prime is 25511621. The reversal of 25511616 is 61611552.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 25511616.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5785 + ... + 9191.

It is an arithmetic number, because the mean of its divisors is an integer number (937768).

Almost surely, 2^25511616 is an apocalyptic number.

25511616 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 25511616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39386256).

25511616 is an abundant number, since it is smaller than the sum of its proper divisors (53260896).

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

25511616 is a wasteful number, since it uses less digits than its factorization.

25511616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3438 (or 3425 counting only the distinct ones).

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

The square root of 25511616 is about 5050.9024936144. The cubic root of 25511616 is about 294.3829523052.

The spelling of 25511616 in words is "twenty-five million, five hundred eleven thousand, six hundred sixteen".