628906171 has 4 divisors (see below), whose sum is σ = 628979832. Its totient is φ = 628832512.

The previous prime is 628906163. The next prime is 628906199. The reversal of 628906171 is 171609826.

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

It is a cyclic number.

It is not a de Polignac number, because 628906171 - 2³ = 628906163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (628906111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22045 + ... + 41758.

It is an arithmetic number, because the mean of its divisors is an integer number (157244958).

Almost surely, 2^628906171 is an apocalyptic number.

628906171 is a deficient number, since it is larger than the sum of its proper divisors (73661).

628906171 is an equidigital number, since it uses as much as digits as its factorization.

628906171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73660.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 628906171 is about 25078.0017345880. The cubic root of 628906171 is about 856.7654643549.

The spelling of 628906171 in words is "six hundred twenty-eight million, nine hundred six thousand, one hundred seventy-one".