25640332 has 12 divisors (see below), whose sum is σ = 45001600. Its totient is φ = 12782736.

The previous prime is 25640311. The next prime is 25640339. The reversal of 25640332 is 23304652.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 25640297 and 25640306.

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 3 ways as a sum of consecutive naturals, for example, 7788 + ... + 10579.

Almost surely, 2^25640332 is an apocalyptic number.

It is an amenable number.

25640332 is a deficient number, since it is larger than the sum of its proper divisors (19361268).

25640332 is a wasteful number, since it uses less digits than its factorization.

25640332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18720 (or 18718 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 25.

The square root of 25640332 is about 5063.6283433917. The cubic root of 25640332 is about 294.8772140544.

Adding to 25640332 its product of nonzero digits (4320), we get a palindrome (25644652).

Adding to 25640332 its reverse (23304652), we get a palindrome (48944984).

The spelling of 25640332 in words is "twenty-five million, six hundred forty thousand, three hundred thirty-two".