17728438707 has 32 divisors (see below), whose sum is σ = 30084303360. Its totient is φ = 10107620640.

The previous prime is 17728438687. The next prime is 17728438733. The reversal of 17728438707 is 70783482771.

It is not a de Polignac number, because 17728438707 - 2⁸ = 17728438451 is a prime.

It is not an unprimeable number, because it can be changed into a prime (17728438747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22144 + ... + 189597.

It is an arithmetic number, because the mean of its divisors is an integer number (940134480).

Almost surely, 2^17728438707 is an apocalyptic number.

17728438707 is a deficient number, since it is larger than the sum of its proper divisors (12355864653).

17728438707 is a wasteful number, since it uses less digits than its factorization.

17728438707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212200 (or 212194 counting only the distinct ones).

The product of its (nonzero) digits is 3687936, while the sum is 54.

The spelling of 17728438707 in words is "seventeen billion, seven hundred twenty-eight million, four hundred thirty-eight thousand, seven hundred seven".