25765 has 4 divisors (see below), whose sum is σ = 30924.
Its totient is φ = 20608.
The previous prime is 25763. The next prime is 25771. The reversal of 25765 is 56752.
It can be divided in two parts, 2576 and 5, that multiplied together give a triangular number (12880 = T160).
25765 = 1132 + 1142.
It is a happy number.
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 12769 + 12996 = 113^2 + 114^2
It is a cyclic number.
It is not a de Polignac number, because 25765 - 21 = 25763 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 (25763) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2572 + ... + 2581.
It is an arithmetic number, because the mean of its divisors is an integer number (7731).
225765 is an apocalyptic number.
25765 is the 114-th centered square number.
It is an amenable number.
25765 is a deficient number, since it is larger than the sum of its proper divisors (5159).
25765 is an equidigital number, since it uses as much as digits as its factorization.
25765 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 5158.
The product of its digits is 2100, while the sum is 25.
The square root of 25765 is about 160.5147968257.
The cubic root of 25765 is about 29.5354357280.
The spelling of 25765 in words is "twenty-five thousand, seven hundred sixty-five".