25628709 has 8 divisors (see below), whose sum is σ = 34432992. Its totient is φ = 16955120.

The previous prime is 25628689. The next prime is 25628717. The reversal of 25628709 is 90782652.

It is a happy number.

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 25628709 - 2¹⁹ = 25104421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25628719) 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, 32214 + ... + 32999.

It is an arithmetic number, because the mean of its divisors is an integer number (4304124).

Almost surely, 2^25628709 is an apocalyptic number.

It is an amenable number.

25628709 is a deficient number, since it is larger than the sum of its proper divisors (8804283).

25628709 is a wasteful number, since it uses less digits than its factorization.

25628709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65347.

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 25628709 is about 5062.4805184810. The cubic root of 25628709 is about 294.8326504625.

The spelling of 25628709 in words is "twenty-five million, six hundred twenty-eight thousand, seven hundred nine".