25687788 has 48 divisors (see below), whose sum is σ = 69189120. Its totient is φ = 7265664.

The previous prime is 25687787. The next prime is 25687801. The reversal of 25687788 is 88778652.

It is a self number, because there is not a number n which added to its sum of digits gives 25687788.

It is not an unprimeable number, because it can be changed into a prime (25687787) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7168 + ... + 10136.

It is an arithmetic number, because the mean of its divisors is an integer number (1441440).

Almost surely, 2^25687788 is an apocalyptic number.

25687788 is a gapful number since it is divisible by the number (28) 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 25687788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34594560).

25687788 is an abundant number, since it is smaller than the sum of its proper divisors (43501332).

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

25687788 is a wasteful number, since it uses less digits than its factorization.

25687788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3086 (or 3084 counting only the distinct ones).

The product of its digits is 1505280, while the sum is 51.

The square root of 25687788 is about 5068.3121450834. The cubic root of 25687788 is about 295.0590248645.

The spelling of 25687788 in words is "twenty-five million, six hundred eighty-seven thousand, seven hundred eighty-eight".