25765515 has 12 divisors (see below), whose sum is σ = 44660304. Its totient is φ = 13741584.

The previous prime is 25765511. The next prime is 25765517. The reversal of 25765515 is 51556752.

It is a happy number.

It is not a de Polignac number, because 25765515 - 2² = 25765511 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25765515.

It is not an unprimeable number, because it can be changed into a prime (25765511) 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 11 ways as a sum of consecutive naturals, for example, 286239 + ... + 286328.

It is an arithmetic number, because the mean of its divisors is an integer number (3721692).

Almost surely, 2^25765515 is an apocalyptic number.

25765515 is a deficient number, since it is larger than the sum of its proper divisors (18894789).

25765515 is a wasteful number, since it uses less digits than its factorization.

25765515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572578 (or 572575 counting only the distinct ones).

The product of its digits is 52500, while the sum is 36.

The square root of 25765515 is about 5075.9742907150. The cubic root of 25765515 is about 295.3563251496.

The spelling of 25765515 in words is "twenty-five million, seven hundred sixty-five thousand, five hundred fifteen".