168987673 has 4 divisors (see below), whose sum is σ = 169291620. Its totient is φ = 168683728.

The previous prime is 168987659. The next prime is 168987697. The reversal of 168987673 is 376789861.

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

It can be written as a sum of positive squares in 2 ways, for example, as 51308569 + 117679104 = 7163^2 + 10848^2 .

It is a cyclic number.

It is not a de Polignac number, because 168987673 - 2²⁵ = 135433241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168987613) 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, 151138 + ... + 152251.

It is an arithmetic number, because the mean of its divisors is an integer number (42322905).

Almost surely, 2^168987673 is an apocalyptic number.

It is an amenable number.

168987673 is a deficient number, since it is larger than the sum of its proper divisors (303947).

168987673 is an equidigital number, since it uses as much as digits as its factorization.

168987673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303946.

The product of its digits is 3048192, while the sum is 55.

The square root of 168987673 is about 12999.5258759695. The cubic root of 168987673 is about 552.8640385939.

The spelling of 168987673 in words is "one hundred sixty-eight million, nine hundred eighty-seven thousand, six hundred seventy-three".