25850005 has 4 divisors (see below), whose sum is σ = 31020012. Its totient is φ = 20680000.

The previous prime is 25850003. The next prime is 25850021. The reversal of 25850005 is 50005852.

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 6507601 + 19342404 = 2551^2 + 4398^2 .

It is not a de Polignac number, because 25850005 - 2¹ = 25850003 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25850003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2584996 + ... + 2585005.

It is an arithmetic number, because the mean of its divisors is an integer number (7755003).

Almost surely, 2^25850005 is an apocalyptic number.

It is an amenable number.

25850005 is a deficient number, since it is larger than the sum of its proper divisors (5170007).

25850005 is an equidigital number, since it uses as much as digits as its factorization.

25850005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5170006.

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 25850005 is about 5084.2900192652. The cubic root of 25850005 is about 295.6788159993.

Adding to 25850005 its reverse (50005852), we get a palindrome (75855857).

The spelling of 25850005 in words is "twenty-five million, eight hundred fifty thousand, five".