25321664 has 28 divisors (see below), whose sum is σ = 50560224. Its totient is φ = 12582144.

The previous prime is 25321663. The next prime is 25321697. The reversal of 25321664 is 46612352.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25321663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9929 + ... + 12215.

Almost surely, 2^25321664 is an apocalyptic number.

It is an amenable number.

25321664 is a deficient number, since it is larger than the sum of its proper divisors (25238560).

25321664 is a wasteful number, since it uses less digits than its factorization.

25321664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2472 (or 2462 counting only the distinct ones).

The product of its digits is 8640, while the sum is 29.

The square root of 25321664 is about 5032.0635926029. The cubic root of 25321664 is about 293.6505017479.

The spelling of 25321664 in words is "twenty-five million, three hundred twenty-one thousand, six hundred sixty-four".