210428009 has 8 divisors (see below), whose sum is σ = 230108160. Its totient is φ = 190839600.

The previous prime is 210428003. The next prime is 210428011. The reversal of 210428009 is 900824012.

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 210428009 - 2⁴ = 210427993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210428003) 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, 18089 + ... + 27350.

It is an arithmetic number, because the mean of its divisors is an integer number (28763520).

Almost surely, 2^210428009 is an apocalyptic number.

It is an amenable number.

210428009 is a deficient number, since it is larger than the sum of its proper divisors (19680151).

210428009 is a wasteful number, since it uses less digits than its factorization.

210428009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45871.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 210428009 is about 14506.1369426874. The cubic root of 210428009 is about 594.7957390333.

The spelling of 210428009 in words is "two hundred ten million, four hundred twenty-eight thousand, nine".