168716640 has 96 divisors (see below), whose sum is σ = 544483296. Its totient is φ = 43888640.

The previous prime is 168716623. The next prime is 168716641. The reversal of 168716640 is 46617861.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×168716640² = 56930609225779200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168716641) 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 15 ways as a sum of consecutive naturals, for example, 15394 + ... + 23966.

It is an arithmetic number, because the mean of its divisors is an integer number (5671701).

Almost surely, 2^168716640 is an apocalyptic number.

168716640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 168716640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (272241648).

168716640 is an abundant number, since it is smaller than the sum of its proper divisors (375766656).

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

168716640 is a wasteful number, since it uses less digits than its factorization.

168716640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8632 (or 8624 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 168716640 is about 12989.0969663022. The cubic root of 168716640 is about 552.5683077915.

The spelling of 168716640 in words is "one hundred sixty-eight million, seven hundred sixteen thousand, six hundred forty".