25687240 has 64 divisors (see below), whose sum is σ = 61804800. Its totient is φ = 9580032.

The previous prime is 25687237. The next prime is 25687247. The reversal of 25687240 is 4278652.

It is a junction number, because it is equal to n+sod(n) for n = 25687196 and 25687205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25687247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55249 + ... + 55711.

It is an arithmetic number, because the mean of its divisors is an integer number (965700).

Almost surely, 2^25687240 is an apocalyptic number.

25687240 is a gapful number since it is divisible by the number (20) 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 25687240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30902400).

25687240 is an abundant number, since it is smaller than the sum of its proper divisors (36117560).

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

25687240 is a wasteful number, since it uses less digits than its factorization.

25687240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566 (or 562 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 34.

The square root of 25687240 is about 5068.2580834050. The cubic root of 25687240 is about 295.0569266756.

The spelling of 25687240 in words is "twenty-five million, six hundred eighty-seven thousand, two hundred forty".