25705865 has 8 divisors (see below), whose sum is σ = 30875208. Its totient is φ = 20545920.

The previous prime is 25705859. The next prime is 25705871. The reversal of 25705865 is 56850752.

It is an interprime number because it is at equal distance from previous prime (25705859) and next prime (25705871).

It can be written as a sum of positive squares in 4 ways, for example, as 344569 + 25361296 = 587^2 + 5036^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25705865 - 2⁸ = 25705609 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 7229 + ... + 10181.

It is an arithmetic number, because the mean of its divisors is an integer number (3859401).

Almost surely, 2^25705865 is an apocalyptic number.

It is an amenable number.

25705865 is a deficient number, since it is larger than the sum of its proper divisors (5169343).

25705865 is a wasteful number, since it uses less digits than its factorization.

25705865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4699.

The product of its (nonzero) digits is 84000, while the sum is 38.

The square root of 25705865 is about 5070.0951667597. The cubic root of 25705865 is about 295.1282215754.

The spelling of 25705865 in words is "twenty-five million, seven hundred five thousand, eight hundred sixty-five".