25640007 has 8 divisors (see below), whose sum is σ = 35289600. Its totient is φ = 16541880.

The previous prime is 25639981. The next prime is 25640023. The reversal of 25640007 is 70004652.

It is a happy number.

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

It is not a de Polignac number, because 25640007 - 2¹¹ = 25637959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25640057) 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, 137757 + ... + 137942.

It is an arithmetic number, because the mean of its divisors is an integer number (4411200).

Almost surely, 2^25640007 is an apocalyptic number.

25640007 is a deficient number, since it is larger than the sum of its proper divisors (9649593).

25640007 is a wasteful number, since it uses less digits than its factorization.

25640007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275733.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 25640007 is about 5063.5962516773. The cubic root of 25640007 is about 294.8759681592.

Adding to 25640007 its reverse (70004652), we get a palindrome (95644659).

The spelling of 25640007 in words is "twenty-five million, six hundred forty thousand, seven".