25688988 has 144 divisors (see below), whose sum is σ = 77051520. Its totient is φ = 7418304.

The previous prime is 25688981. The next prime is 25689029. The reversal of 25688988 is 88988652.

It is a Harshad number since it is a multiple of its sum of digits (54).

Its product of digits (2211840) is a multiple of the sum of its prime divisors (144).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25688981) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 240031 + ... + 240137.

It is an arithmetic number, because the mean of its divisors is an integer number (535080).

Almost surely, 2^25688988 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 25688988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38525760).

25688988 is an abundant number, since it is smaller than the sum of its proper divisors (51362532).

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

25688988 is a wasteful number, since it uses less digits than its factorization.

25688988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158 (or 144 counting only the distinct ones).

The product of its digits is 2211840, while the sum is 54.

The square root of 25688988 is about 5068.4305263069. The cubic root of 25688988 is about 295.0636193346.

The spelling of 25688988 in words is "twenty-five million, six hundred eighty-eight thousand, nine hundred eighty-eight".