25800505 has 4 divisors (see below), whose sum is σ = 30960612. Its totient is φ = 20640400.

The previous prime is 25800497. The next prime is 25800547. The reversal of 25800505 is 50500852.

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 17943696 + 7856809 = 4236^2 + 2803^2 .

It is not a de Polignac number, because 25800505 - 2³ = 25800497 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 25800505.

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, 2580046 + ... + 2580055.

It is an arithmetic number, because the mean of its divisors is an integer number (7740153).

Almost surely, 2^25800505 is an apocalyptic number.

It is an amenable number.

25800505 is a deficient number, since it is larger than the sum of its proper divisors (5160107).

25800505 is an equidigital number, since it uses as much as digits as its factorization.

25800505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5160106.

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

The square root of 25800505 is about 5079.4197503258. The cubic root of 25800505 is about 295.4899642817.

The spelling of 25800505 in words is "twenty-five million, eight hundred thousand, five hundred five".