168997590 has 160 divisors (see below), whose sum is σ = 487872000. Its totient is φ = 41850432.

The previous prime is 168997589. The next prime is 168997603. The reversal of 168997590 is 95799861.

It is a Harshad number since it is a multiple of its sum of digits (54).

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 79 ways as a sum of consecutive naturals, for example, 1215741 + ... + 1215879.

It is an arithmetic number, because the mean of its divisors is an integer number (3049200).

Almost surely, 2^168997590 is an apocalyptic number.

168997590 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 168997590, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (243936000).

168997590 is an abundant number, since it is smaller than the sum of its proper divisors (318874410).

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

168997590 is a wasteful number, since it uses less digits than its factorization.

168997590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256 (or 247 counting only the distinct ones).

The product of its (nonzero) digits is 1224720, while the sum is 54.

The square root of 168997590 is about 12999.9073073618. The cubic root of 168997590 is about 552.8748532790.

The spelling of 168997590 in words is "one hundred sixty-eight million, nine hundred ninety-seven thousand, five hundred ninety".