25775215 has 4 divisors (see below), whose sum is σ = 30930264. Its totient is φ = 20620168.

The previous prime is 25775209. The next prime is 25775219. The reversal of 25775215 is 51257752.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25775215 - 2³ = 25775207 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 (25775219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2577517 + ... + 2577526.

It is an arithmetic number, because the mean of its divisors is an integer number (7732566).

Almost surely, 2^25775215 is an apocalyptic number.

25775215 is a deficient number, since it is larger than the sum of its proper divisors (5155049).

25775215 is an equidigital number, since it uses as much as digits as its factorization.

25775215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5155048.

The product of its digits is 24500, while the sum is 34.

The square root of 25775215 is about 5076.9296823966. The cubic root of 25775215 is about 295.3933849807.

The spelling of 25775215 in words is "twenty-five million, seven hundred seventy-five thousand, two hundred fifteen".