28626909 has 8 divisors (see below), whose sum is σ = 38412960. Its totient is φ = 18962736.

The previous prime is 28626907. The next prime is 28626947. The reversal of 28626909 is 90962682.

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

It is not a de Polignac number, because 28626909 - 2¹ = 28626907 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28626907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29919 + ... + 30860.

It is an arithmetic number, because the mean of its divisors is an integer number (4801620).

Almost surely, 2^28626909 is an apocalyptic number.

It is an amenable number.

28626909 is a deficient number, since it is larger than the sum of its proper divisors (9786051).

28626909 is a wasteful number, since it uses less digits than its factorization.

28626909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60939.

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 28626909 is about 5350.4120402077. The cubic root of 28626909 is about 305.9084586701.

The spelling of 28626909 in words is "twenty-eight million, six hundred twenty-six thousand, nine hundred nine".