171728858587 has 16 divisors (see below), whose sum is σ = 201790280160. Its totient is φ = 144080352000.

The previous prime is 171728858459. The next prime is 171728858603. The reversal of 171728858587 is 785858827171.

It is not a de Polignac number, because 171728858587 - 2⁷ = 171728858459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (171728858387) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 646087 + ... + 872287.

It is an arithmetic number, because the mean of its divisors is an integer number (12611892510).

Almost surely, 2^171728858587 is an apocalyptic number.

171728858587 is a deficient number, since it is larger than the sum of its proper divisors (30061421573).

171728858587 is a wasteful number, since it uses less digits than its factorization.

171728858587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231534.

The product of its digits is 70246400, while the sum is 67.

The spelling of 171728858587 in words is "one hundred seventy-one billion, seven hundred twenty-eight million, eight hundred fifty-eight thousand, five hundred eighty-seven".