25240320 has 216 divisors, whose sum is σ = 100123296. Its totient is φ = 5750784.

The previous prime is 25240283. The next prime is 25240321. The reversal of 25240320 is 2304252.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 25240293 and 25240302.

It is not an unprimeable number, because it can be changed into a prime (25240321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 80484 + ... + 80796.

Almost surely, 2^25240320 is an apocalyptic number.

25240320 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 25240320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50061648).

25240320 is an abundant number, since it is smaller than the sum of its proper divisors (74882976).

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

25240320 is a wasteful number, since it uses less digits than its factorization.

25240320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347 (or 330 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 25240320 is about 5023.9745222284. The cubic root of 25240320 is about 293.3357208254.

Adding to 25240320 its reverse (2304252), we get a palindrome (27544572).

The spelling of 25240320 in words is "twenty-five million, two hundred forty thousand, three hundred twenty".