17986728357 has 12 divisors (see below), whose sum is σ = 27979355404. Its totient is φ = 11068755840.

The previous prime is 17986728337. The next prime is 17986728407. The reversal of 17986728357 is 75382768971.

It can be written as a sum of positive squares in 2 ways, for example, as 4685950116 + 13300778241 = 68454^2 + 115329^2 .

It is not a de Polignac number, because 17986728357 - 2⁸ = 17986728101 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 17986728294 and 17986728303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17986728307) 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, 76866244 + ... + 76866477.

Almost surely, 2^17986728357 is an apocalyptic number.

It is an amenable number.

17986728357 is a deficient number, since it is larger than the sum of its proper divisors (9992627047).

17986728357 is a wasteful number, since it uses less digits than its factorization.

17986728357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153732740 (or 153732737 counting only the distinct ones).

The product of its digits is 35562240, while the sum is 63.

The spelling of 17986728357 in words is "seventeen billion, nine hundred eighty-six million, seven hundred twenty-eight thousand, three hundred fifty-seven".