25025640 has 64 divisors (see below), whose sum is σ = 75418560. Its totient is φ = 6643200.

The previous prime is 25025629. The next prime is 25025687. The reversal of 25025640 is 4652052.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 25025640.

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, 41340 + ... + 41940.

It is an arithmetic number, because the mean of its divisors is an integer number (1178415).

Almost surely, 2^25025640 is an apocalyptic number.

25025640 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 25025640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37709280).

25025640 is an abundant number, since it is smaller than the sum of its proper divisors (50392920).

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

25025640 is a wasteful number, since it uses less digits than its factorization.

25025640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 962 (or 958 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 25025640 is about 5002.5633429273. The cubic root of 25025640 is about 292.5017020867.

Adding to 25025640 its reverse (4652052), we get a palindrome (29677692).

The spelling of 25025640 in words is "twenty-five million, twenty-five thousand, six hundred forty".