168890 has 8 divisors (see below), whose sum is σ = 304020. Its totient is φ = 67552.

The previous prime is 168887. The next prime is 168893. The reversal of 168890 is 98861.

It is an interprime number because it is at equal distance from previous prime (168887) and next prime (168893).

It can be written as a sum of positive squares in 2 ways, for example, as 146689 + 22201 = 383^2 + 149^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (168893) 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, 8435 + ... + 8454.

2¹⁶⁸⁸⁹⁰ is an apocalyptic number.

168890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

168890 is a deficient number, since it is larger than the sum of its proper divisors (135130).

168890 is a wasteful number, since it uses less digits than its factorization.

168890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16896.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 168890 is about 410.9622853742. The cubic root of 168890 is about 55.2757501639.

The spelling of 168890 in words is "one hundred sixty-eight thousand, eight hundred ninety".