168493890 has 32 divisors (see below), whose sum is σ = 412019136. Its totient is φ = 44083520.

The previous prime is 168493879. The next prime is 168493921. The reversal of 168493890 is 98394861.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51396 + ... + 54575.

It is an arithmetic number, because the mean of its divisors is an integer number (12875598).

Almost surely, 2^168493890 is an apocalyptic number.

168493890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

168493890 is an abundant number, since it is smaller than the sum of its proper divisors (243525246).

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

168493890 is a wasteful number, since it uses less digits than its factorization.

168493890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106034.

The product of its (nonzero) digits is 373248, while the sum is 48.

The square root of 168493890 is about 12980.5196352072. The cubic root of 168493890 is about 552.3250225644.

The spelling of 168493890 in words is "one hundred sixty-eight million, four hundred ninety-three thousand, eight hundred ninety".