168499990 has 8 divisors (see below), whose sum is σ = 303300000. Its totient is φ = 67399992.

The previous prime is 168499957. The next prime is 168499993. The reversal of 168499990 is 99994861.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168499993) 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, 8424990 + ... + 8425009.

It is an arithmetic number, because the mean of its divisors is an integer number (37912500).

Almost surely, 2^168499990 is an apocalyptic number.

168499990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

168499990 is a deficient number, since it is larger than the sum of its proper divisors (134800010).

168499990 is a wasteful number, since it uses less digits than its factorization.

168499990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16850006.

The product of its (nonzero) digits is 1259712, while the sum is 55.

The square root of 168499990 is about 12980.7546005616. The cubic root of 168499990 is about 552.3316877754.

The spelling of 168499990 in words is "one hundred sixty-eight million, four hundred ninety-nine thousand, nine hundred ninety".