168188740 has 12 divisors (see below), whose sum is σ = 353196396. Its totient is φ = 67275488.

The previous prime is 168188737. The next prime is 168188743. The reversal of 168188740 is 47881861.

It is an interprime number because it is at equal distance from previous prime (168188737) and next prime (168188743).

It can be written as a sum of positive squares in 2 ways, for example, as 70257924 + 97930816 = 8382^2 + 9896^2 .

It is not an unprimeable number, because it can be changed into a prime (168188743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4204699 + ... + 4204738.

It is an arithmetic number, because the mean of its divisors is an integer number (29433033).

Almost surely, 2^168188740 is an apocalyptic number.

168188740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

168188740 is an abundant number, since it is smaller than the sum of its proper divisors (185007656).

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

168188740 is a wasteful number, since it uses less digits than its factorization.

168188740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8409446 (or 8409444 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 43.

The square root of 168188740 is about 12968.7601566225. The cubic root of 168188740 is about 551.9913926054.

The spelling of 168188740 in words is "one hundred sixty-eight million, one hundred eighty-eight thousand, seven hundred forty".