25006643 has 8 divisors (see below), whose sum is σ = 26536320. Its totient is φ = 23483520.

The previous prime is 25006621. The next prime is 25006673. The reversal of 25006643 is 34660052.

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 25006643 - 2¹² = 25002547 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25006673) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7838 + ... + 10556.

It is an arithmetic number, because the mean of its divisors is an integer number (3317040).

Almost surely, 2^25006643 is an apocalyptic number.

25006643 is a deficient number, since it is larger than the sum of its proper divisors (1529677).

25006643 is a wasteful number, since it uses less digits than its factorization.

25006643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3277.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 25006643 is about 5000.6642558764. The cubic root of 25006643 is about 292.4276705274.

Adding to 25006643 its reverse (34660052), we get a palindrome (59666695).

The spelling of 25006643 in words is "twenty-five million, six thousand, six hundred forty-three".