168307840 has 32 divisors (see below), whose sum is σ = 402362460. Its totient is φ = 67322880.

The previous prime is 168307817. The next prime is 168307847. The reversal of 168307840 is 48703861.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 167754304 + 553536 = 12952^2 + 744^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 168307840.

It is not an unprimeable number, because it can be changed into a prime (168307847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130851 + ... + 132130.

Almost surely, 2^168307840 is an apocalyptic number.

168307840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

168307840 is an abundant number, since it is smaller than the sum of its proper divisors (234054620).

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

168307840 is an equidigital number, since it uses as much as digits as its factorization.

168307840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263000 (or 262988 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 168307840 is about 12973.3511476411. The cubic root of 168307840 is about 552.1216563058.

The spelling of 168307840 in words is "one hundred sixty-eight million, three hundred seven thousand, eight hundred forty".