25868721 has 8 divisors (see below), whose sum is σ = 35991360. Its totient is φ = 16495952.

The previous prime is 25868681. The next prime is 25868723. The reversal of 25868721 is 12786852.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25868721 - 2⁶ = 25868657 is a prime.

It is a super-3 number, since 3×25868721³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25868721.

It is not an unprimeable number, because it can be changed into a prime (25868723) 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, 187386 + ... + 187523.

It is an arithmetic number, because the mean of its divisors is an integer number (4498920).

Almost surely, 2^25868721 is an apocalyptic number.

It is an amenable number.

25868721 is a deficient number, since it is larger than the sum of its proper divisors (10122639).

25868721 is a wasteful number, since it uses less digits than its factorization.

25868721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374935.

The product of its digits is 53760, while the sum is 39.

The square root of 25868721 is about 5086.1302578680. The cubic root of 25868721 is about 295.7501582124.

The spelling of 25868721 in words is "twenty-five million, eight hundred sixty-eight thousand, seven hundred twenty-one".