25128085 has 4 divisors (see below), whose sum is σ = 30153708. Its totient is φ = 20102464.

The previous prime is 25128067. The next prime is 25128101. The reversal of 25128085 is 58082152.

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 18584721 + 6543364 = 4311^2 + 2558^2 .

It is a cyclic number.

It is not a de Polignac number, because 25128085 - 2⁹ = 25127573 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

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, 2512804 + ... + 2512813.

It is an arithmetic number, because the mean of its divisors is an integer number (7538427).

Almost surely, 2^25128085 is an apocalyptic number.

It is an amenable number.

25128085 is a deficient number, since it is larger than the sum of its proper divisors (5025623).

25128085 is an equidigital number, since it uses as much as digits as its factorization.

25128085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5025622.

The product of its (nonzero) digits is 6400, while the sum is 31.

The square root of 25128085 is about 5012.7921361253. The cubic root of 25128085 is about 292.9002871763.

The spelling of 25128085 in words is "twenty-five million, one hundred twenty-eight thousand, eighty-five".