25688643 has 16 divisors (see below), whose sum is σ = 34884000. Its totient is φ = 16812800.

The previous prime is 25688639. The next prime is 25688651. The reversal of 25688643 is 34688652.

It is a cyclic number.

It is not a de Polignac number, because 25688643 - 2² = 25688639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25688595 and 25688604.

It is not an unprimeable number, because it can be changed into a prime (25688633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44863 + ... + 45431.

It is an arithmetic number, because the mean of its divisors is an integer number (2180250).

Almost surely, 2^25688643 is an apocalyptic number.

25688643 is a deficient number, since it is larger than the sum of its proper divisors (9195357).

25688643 is a wasteful number, since it uses less digits than its factorization.

25688643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822.

The product of its digits is 276480, while the sum is 42.

The square root of 25688643 is about 5068.3964919884. The cubic root of 25688643 is about 295.0622984391.

Subtracting 25688643 from its reverse (34688652), we obtain a palindrome (9000009).

It can be divided in two parts, 2568 and 8643, that added together give a palindrome (11211).

The spelling of 25688643 in words is "twenty-five million, six hundred eighty-eight thousand, six hundred forty-three".