168172890 has 16 divisors (see below), whose sum is σ = 403615008. Its totient is φ = 44846096.

The previous prime is 168172889. The next prime is 168172897. The reversal of 168172890 is 98271861.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (168172897) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2802852 + ... + 2802911.

It is an arithmetic number, because the mean of its divisors is an integer number (25225938).

Almost surely, 2^168172890 is an apocalyptic number.

168172890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

168172890 is an abundant number, since it is smaller than the sum of its proper divisors (235442118).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

168172890 is a wasteful number, since it uses less digits than its factorization.

168172890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5605773.

The product of its (nonzero) digits is 48384, while the sum is 42.

The square root of 168172890 is about 12968.1490583660. The cubic root of 168172890 is about 551.9740522880.

The spelling of 168172890 in words is "one hundred sixty-eight million, one hundred seventy-two thousand, eight hundred ninety".