168261890 has 16 divisors (see below), whose sum is σ = 303194880. Its totient is φ = 67232880.

The previous prime is 168261889. The next prime is 168261911. The reversal of 168261890 is 98162861.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1421 + ... + 18399.

It is an arithmetic number, because the mean of its divisors is an integer number (18949680).

Almost surely, 2^168261890 is an apocalyptic number.

168261890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

168261890 is a deficient number, since it is larger than the sum of its proper divisors (134932990).

168261890 is a wasteful number, since it uses less digits than its factorization.

168261890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17977.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 168261890 is about 12971.5800887941. The cubic root of 168261890 is about 552.0714065190.

The spelling of 168261890 in words is "one hundred sixty-eight million, two hundred sixty-one thousand, eight hundred ninety".