25640099 has 8 divisors (see below), whose sum is σ = 26189280. Its totient is φ = 25096896.

The previous prime is 25640081. The next prime is 25640171. The reversal of 25640099 is 99004652.

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 25640099 - 2⁸ = 25639843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25640059) 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, 7769 + ... + 10565.

It is an arithmetic number, because the mean of its divisors is an integer number (3273660).

Almost surely, 2^25640099 is an apocalyptic number.

25640099 is a deficient number, since it is larger than the sum of its proper divisors (549181).

25640099 is a wasteful number, since it uses less digits than its factorization.

25640099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2989.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 25640099 is about 5063.6053361217. The cubic root of 25640099 is about 294.8763208444.

The spelling of 25640099 in words is "twenty-five million, six hundred forty thousand, ninety-nine".