206228709 has 12 divisors (see below), whose sum is σ = 307495552. Its totient is φ = 133050600.

The previous prime is 206228699. The next prime is 206228749. The reversal of 206228709 is 907822602.

206228709 is a `hidden beast` number, since 20 + 622 + 8 + 7 + 0 + 9 = 666.

206228709 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 206228709 - 2¹¹ = 206226661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206228749) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 369307 + ... + 369864.

Almost surely, 2^206228709 is an apocalyptic number.

It is an amenable number.

206228709 is a deficient number, since it is larger than the sum of its proper divisors (101266843).

206228709 is a wasteful number, since it uses less digits than its factorization.

206228709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 739208 (or 739205 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 206228709 is about 14360.6653397397. The cubic root of 206228709 is about 590.8125441540.

The spelling of 206228709 in words is "two hundred six million, two hundred twenty-eight thousand, seven hundred nine".