209630028 has 12 divisors (see below), whose sum is σ = 489136760. Its totient is φ = 69876672.

The previous prime is 209629997. The next prime is 209630041. The reversal of 209630028 is 820036902.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 209629977 and 209630004.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8734573 + ... + 8734596.

Almost surely, 2^209630028 is an apocalyptic number.

It is an amenable number.

209630028 is an abundant number, since it is smaller than the sum of its proper divisors (279506732).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

209630028 is a wasteful number, since it uses less digits than its factorization.

209630028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17469176 (or 17469174 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 209630028 is about 14478.6058721135. The cubic root of 209630028 is about 594.0429290245.

The spelling of 209630028 in words is "two hundred nine million, six hundred thirty thousand, twenty-eight".