25200640 has 96 divisors (see below), whose sum is σ = 63685440. Its totient is φ = 9551872.

The previous prime is 25200607. The next prime is 25200653. The reversal of 25200640 is 4600252.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 235467 + ... + 235573.

It is an arithmetic number, because the mean of its divisors is an integer number (663390).

Almost surely, 2^25200640 is an apocalyptic number.

25200640 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 25200640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31842720).

25200640 is an abundant number, since it is smaller than the sum of its proper divisors (38484800).

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

25200640 is a wasteful number, since it uses less digits than its factorization.

25200640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157 (or 137 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 25200640 is about 5020.0239043256. The cubic root of 25200640 is about 293.1819236970.

Adding to 25200640 its reverse (4600252), we get a palindrome (29800892).

The spelling of 25200640 in words is "twenty-five million, two hundred thousand, six hundred forty".