168424660 has 24 divisors (see below), whose sum is σ = 359492616. Its totient is φ = 66264960.

The previous prime is 168424657. The next prime is 168424681. The reversal of 168424660 is 66424861.

It can be written as a sum of positive squares in 4 ways, for example, as 10771524 + 157653136 = 3282^2 + 12556^2 .

It is a super-3 number, since 3×168424660³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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 7 ways as a sum of consecutive naturals, for example, 67807 + ... + 70246.

It is an arithmetic number, because the mean of its divisors is an integer number (14978859).

Almost surely, 2^168424660 is an apocalyptic number.

168424660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

168424660 is an abundant number, since it is smaller than the sum of its proper divisors (191067956).

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

168424660 is a wasteful number, since it uses less digits than its factorization.

168424660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138123 (or 138121 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 37.

The square root of 168424660 is about 12977.8526729194. The cubic root of 168424660 is about 552.2493666075.

The spelling of 168424660 in words is "one hundred sixty-eight million, four hundred twenty-four thousand, six hundred sixty".