25216240 has 80 divisors (see below), whose sum is σ = 68870592. Its totient is φ = 8404992.

The previous prime is 25216229. The next prime is 25216273. The reversal of 25216240 is 4261252.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20112 + ... + 21328.

Almost surely, 2^25216240 is an apocalyptic number.

25216240 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 25216240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34435296).

25216240 is an abundant number, since it is smaller than the sum of its proper divisors (43654352).

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

25216240 is a wasteful number, since it uses less digits than its factorization.

25216240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1274 (or 1268 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 25216240 is about 5021.5774414023. The cubic root of 25216240 is about 293.2424075391.

Adding to 25216240 its reverse (4261252), we get a palindrome (29477492).

The spelling of 25216240 in words is "twenty-five million, two hundred sixteen thousand, two hundred forty".