25642215 has 24 divisors (see below), whose sum is σ = 45015360. Its totient is φ = 13500864.

The previous prime is 25642207. The next prime is 25642219. The reversal of 25642215 is 51224652.

25642215 is a `hidden beast` number, since 2 + 5 + 642 + 2 + 15 = 666.

It is not a de Polignac number, because 25642215 - 2³ = 25642207 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25642219) 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 23 ways as a sum of consecutive naturals, for example, 52 + ... + 7161.

It is an arithmetic number, because the mean of its divisors is an integer number (1875640).

Almost surely, 2^25642215 is an apocalyptic number.

25642215 is a deficient number, since it is larger than the sum of its proper divisors (19373145).

25642215 is a wasteful number, since it uses less digits than its factorization.

25642215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7303 (or 7300 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 25642215 is about 5063.8142738454. The cubic root of 25642215 is about 294.8844323723.

Adding to 25642215 its reverse (51224652), we get a palindrome (76866867).

The spelling of 25642215 in words is "twenty-five million, six hundred forty-two thousand, two hundred fifteen".