25680240 has 120 divisors (see below), whose sum is σ = 89504688. Its totient is φ = 6842880.

The previous prime is 25680233. The next prime is 25680247. The reversal of 25680240 is 4208652.

It is an interprime number because it is at equal distance from previous prime (25680233) and next prime (25680247).

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25680247) 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 23 ways as a sum of consecutive naturals, for example, 18780 + ... + 20100.

Almost surely, 2^25680240 is an apocalyptic number.

25680240 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 25680240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44752344).

25680240 is an abundant number, since it is smaller than the sum of its proper divisors (63824448).

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

25680240 is a wasteful number, since it uses less digits than its factorization.

25680240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1349 (or 1331 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 25680240 is about 5067.5674637838. The cubic root of 25680240 is about 295.0301223670.

Adding to 25680240 its reverse (4208652), we get a palindrome (29888892).

The spelling of 25680240 in words is "twenty-five million, six hundred eighty thousand, two hundred forty".