25640330 has 16 divisors (see below), whose sum is σ = 46422504. Its totient is φ = 10196160.

The previous prime is 25640311. The next prime is 25640339. The reversal of 25640330 is 3304652.

It can be written as a sum of positive squares in 4 ways, for example, as 24019801 + 1620529 = 4901^2 + 1273^2 .

It is a junction number, because it is equal to n+sod(n) for n = 25640296 and 25640305.

It is not an unprimeable number, because it can be changed into a prime (25640339) 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 7 ways as a sum of consecutive naturals, for example, 5681 + ... + 9140.

Almost surely, 2^25640330 is an apocalyptic number.

25640330 is a deficient number, since it is larger than the sum of its proper divisors (20782174).

25640330 is a wasteful number, since it uses less digits than its factorization.

25640330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15001.

The product of its (nonzero) digits is 2160, while the sum is 23.

The square root of 25640330 is about 5063.6281459049. The cubic root of 25640330 is about 294.8772063874.

Adding to 25640330 its reverse (3304652), we get a palindrome (28944982).

The spelling of 25640330 in words is "twenty-five million, six hundred forty thousand, three hundred thirty".