25128385 has 4 divisors (see below), whose sum is σ = 30154068. Its totient is φ = 20102704.

The previous prime is 25128377. The next prime is 25128421. The reversal of 25128385 is 58382152.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10870209 + 14258176 = 3297^2 + 3776^2 .

It is a cyclic number.

It is not a de Polignac number, because 25128385 - 2³ = 25128377 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25128385.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2512834 + ... + 2512843.

It is an arithmetic number, because the mean of its divisors is an integer number (7538517).

Almost surely, 2^25128385 is an apocalyptic number.

It is an amenable number.

25128385 is a deficient number, since it is larger than the sum of its proper divisors (5025683).

25128385 is an equidigital number, since it uses as much as digits as its factorization.

25128385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5025682.

The product of its digits is 19200, while the sum is 34.

The square root of 25128385 is about 5012.8220594791. The cubic root of 25128385 is about 292.9014528009.

The spelling of 25128385 in words is "twenty-five million, one hundred twenty-eight thousand, three hundred eighty-five".