25198128 has 60 divisors (see below), whose sum is σ = 73142888. Its totient is φ = 8398080.

The previous prime is 25198111. The next prime is 25198163. The reversal of 25198128 is 82189152.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 25198092 and 25198101.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 648 + ... + 7128.

Almost surely, 2^25198128 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 25198128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36571444).

25198128 is an abundant number, since it is smaller than the sum of its proper divisors (47944760).

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

25198128 is an equidigital number, since it uses as much as digits as its factorization.

25198128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6504 (or 6486 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 25198128 is about 5019.7737000785. The cubic root of 25198128 is about 293.1721819145.

The spelling of 25198128 in words is "twenty-five million, one hundred ninety-eight thousand, one hundred twenty-eight".