25730215 has 16 divisors (see below), whose sum is σ = 36822528. Its totient is φ = 16875936.

The previous prime is 25730209. The next prime is 25730219. The reversal of 25730215 is 51203752.

It is not a de Polignac number, because 25730215 - 2⁷ = 25730087 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 25730215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25730219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15177 + ... + 16786.

It is an arithmetic number, because the mean of its divisors is an integer number (2301408).

Almost surely, 2^25730215 is an apocalyptic number.

25730215 is a deficient number, since it is larger than the sum of its proper divisors (11092313).

25730215 is a wasteful number, since it uses less digits than its factorization.

25730215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31998.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 25730215 is about 5072.4959339560. The cubic root of 25730215 is about 295.2213793597.

Adding to 25730215 its reverse (51203752), we get a palindrome (76933967).

The spelling of 25730215 in words is "twenty-five million, seven hundred thirty thousand, two hundred fifteen".