168257990 has 8 divisors (see below), whose sum is σ = 302864400. Its totient is φ = 67303192.

The previous prime is 168257989. The next prime is 168258007. The reversal of 168257990 is 99752861.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8412890 + ... + 8412909.

It is an arithmetic number, because the mean of its divisors is an integer number (37858050).

Almost surely, 2^168257990 is an apocalyptic number.

168257990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

168257990 is a deficient number, since it is larger than the sum of its proper divisors (134606410).

168257990 is a wasteful number, since it uses less digits than its factorization.

168257990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16825806.

The product of its (nonzero) digits is 272160, while the sum is 47.

The square root of 168257990 is about 12971.4297592825. The cubic root of 168257990 is about 552.0671411540.

The spelling of 168257990 in words is "one hundred sixty-eight million, two hundred fifty-seven thousand, nine hundred ninety".