210728133 has 24 divisors (see below), whose sum is σ = 379494336. Its totient is φ = 109468800.

The previous prime is 210728131. The next prime is 210728143. The reversal of 210728133 is 331827012.

It is not a de Polignac number, because 210728133 - 2¹ = 210728131 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 210728097 and 210728106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210728131) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 151348 + ... + 152733.

It is an arithmetic number, because the mean of its divisors is an integer number (15812264).

Almost surely, 2^210728133 is an apocalyptic number.

It is an amenable number.

210728133 is a deficient number, since it is larger than the sum of its proper divisors (168766203).

210728133 is a wasteful number, since it uses less digits than its factorization.

210728133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304105 (or 304102 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 210728133 is about 14516.4779819349. The cubic root of 210728133 is about 595.0783815014.

The spelling of 210728133 in words is "two hundred ten million, seven hundred twenty-eight thousand, one hundred thirty-three".