171628087 has 4 divisors (see below), whose sum is σ = 174045456. Its totient is φ = 169210720.

The previous prime is 171628069. The next prime is 171628099. The reversal of 171628087 is 780826171.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-171628087 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171628057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1208578 + ... + 1208719.

It is an arithmetic number, because the mean of its divisors is an integer number (43511364).

Almost surely, 2^171628087 is an apocalyptic number.

171628087 is a deficient number, since it is larger than the sum of its proper divisors (2417369).

171628087 is an equidigital number, since it uses as much as digits as its factorization.

171628087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2417368.

The product of its (nonzero) digits is 37632, while the sum is 40.

The square root of 171628087 is about 13100.6903253226. The cubic root of 171628087 is about 555.7286503935.

The spelling of 171628087 in words is "one hundred seventy-one million, six hundred twenty-eight thousand, eighty-seven".