206728467509 has 8 divisors (see below), whose sum is σ = 207333929088. Its totient is φ = 206123235840.

The previous prime is 206728467499. The next prime is 206728467553. The reversal of 206728467509 is 905764827602.

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 206728467509 - 2¹⁶ = 206728401973 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 (206728467599) 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, 1834229 + ... + 1943669.

It is an arithmetic number, because the mean of its divisors is an integer number (25916741136).

Almost surely, 2^206728467509 is an apocalyptic number.

It is an amenable number.

206728467509 is a deficient number, since it is larger than the sum of its proper divisors (605461579).

206728467509 is a wasteful number, since it uses less digits than its factorization.

206728467509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114955.

The product of its (nonzero) digits is 10160640, while the sum is 56.

The spelling of 206728467509 in words is "two hundred six billion, seven hundred twenty-eight million, four hundred sixty-seven thousand, five hundred nine".