209445028 has 12 divisors (see below), whose sum is σ = 394723420. Its totient is φ = 96666912.

The previous prime is 209445001. The next prime is 209445031. The reversal of 209445028 is 820544902.

209445028 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 54641664 + 154803364 = 7392^2 + 12442^2 .

It is a junction number, because it is equal to n+sod(n) for n = 209444984 and 209445002.

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, 2013843 + ... + 2013946.

Almost surely, 2^209445028 is an apocalyptic number.

It is an amenable number.

209445028 is a deficient number, since it is larger than the sum of its proper divisors (185278392).

209445028 is a wasteful number, since it uses less digits than its factorization.

209445028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4027806 (or 4027804 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 209445028 is about 14472.2157253131. The cubic root of 209445028 is about 593.8681285481.

The spelling of 209445028 in words is "two hundred nine million, four hundred forty-five thousand, twenty-eight".