25640612 has 12 divisors (see below), whose sum is σ = 45157980. Its totient is φ = 12738336.

The previous prime is 25640603. The next prime is 25640617. The reversal of 25640612 is 21604652.

It can be written as a sum of positive squares in 2 ways, for example, as 19219456 + 6421156 = 4384^2 + 2534^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25640617) 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, 19787 + ... + 21042.

It is an arithmetic number, because the mean of its divisors is an integer number (3763165).

Almost surely, 2^25640612 is an apocalyptic number.

It is an amenable number.

25640612 is a deficient number, since it is larger than the sum of its proper divisors (19517368).

25640612 is a wasteful number, since it uses less digits than its factorization.

25640612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40990 (or 40988 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 25640612 is about 5063.6559914749. The cubic root of 25640612 is about 294.8782874326.

The spelling of 25640612 in words is "twenty-five million, six hundred forty thousand, six hundred twelve".