25257320 has 64 divisors (see below), whose sum is σ = 62596800. Its totient is φ = 9095680.

The previous prime is 25257301. The next prime is 25257329. The reversal of 25257320 is 2375252.

It is a self number, because there is not a number n which added to its sum of digits gives 25257320.

It is not an unprimeable number, because it can be changed into a prime (25257329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60071 + ... + 60489.

It is an arithmetic number, because the mean of its divisors is an integer number (978075).

Almost surely, 2^25257320 is an apocalyptic number.

25257320 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 25257320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31298400).

25257320 is an abundant number, since it is smaller than the sum of its proper divisors (37339480).

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

25257320 is a wasteful number, since it uses less digits than its factorization.

25257320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578 (or 574 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 26.

The square root of 25257320 is about 5025.6661250027. Note that the first 3 decimals coincide. The cubic root of 25257320 is about 293.4015624116.

The spelling of 25257320 in words is "twenty-five million, two hundred fifty-seven thousand, three hundred twenty".