25721968 has 20 divisors (see below), whose sum is σ = 49938768. Its totient is φ = 12834560.

The previous prime is 25721963. The next prime is 25721977. The reversal of 25721968 is 86912752.

It is a self number, because there is not a number n which added to its sum of digits gives 25721968.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25721963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8133 + ... + 10843.

Almost surely, 2^25721968 is an apocalyptic number.

It is an amenable number.

25721968 is a deficient number, since it is larger than the sum of its proper divisors (24216800).

25721968 is a wasteful number, since it uses less digits than its factorization.

25721968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3312 (or 3306 counting only the distinct ones).

The product of its digits is 60480, while the sum is 40.

The square root of 25721968 is about 5071.6829553906. The cubic root of 25721968 is about 295.1898347227.

The spelling of 25721968 in words is "twenty-five million, seven hundred twenty-one thousand, nine hundred sixty-eight".