25280128 has 64 divisors (see below), whose sum is σ = 54443520. Its totient is φ = 11658240.

The previous prime is 25280113. The next prime is 25280137. The reversal of 25280128 is 82108252.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 25280096 and 25280105.

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, 91126 + ... + 91402.

It is an arithmetic number, because the mean of its divisors is an integer number (850680).

Almost surely, 2^25280128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25280128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27221760).

25280128 is an abundant number, since it is smaller than the sum of its proper divisors (29163392).

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

25280128 is a wasteful number, since it uses less digits than its factorization.

25280128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345 (or 333 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 25280128 is about 5027.9347648910. The cubic root of 25280128 is about 293.4898521896.

The spelling of 25280128 in words is "twenty-five million, two hundred eighty thousand, one hundred twenty-eight".