17928009729 has 12 divisors (see below), whose sum is σ = 29595444736. Its totient is φ = 10244576952.

The previous prime is 17928009667. The next prime is 17928009733. The reversal of 17928009729 is 92790082971.

It is not a de Polignac number, because 17928009729 - 2²⁷ = 17793792001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17928009529) 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, 142285729 + ... + 142285854.

Almost surely, 2^17928009729 is an apocalyptic number.

It is an amenable number.

17928009729 is a deficient number, since it is larger than the sum of its proper divisors (11667435007).

17928009729 is a wasteful number, since it uses less digits than its factorization.

17928009729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284571596 (or 284571593 counting only the distinct ones).

The product of its (nonzero) digits is 1143072, while the sum is 54.

The spelling of 17928009729 in words is "seventeen billion, nine hundred twenty-eight million, nine thousand, seven hundred twenty-nine".