168697728 has 160 divisors (see below), whose sum is σ = 513180360. Its totient is φ = 54991872.

The previous prime is 168697723. The next prime is 168697741. The reversal of 168697728 is 827796861.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168697721) 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 19 ways as a sum of consecutive naturals, for example, 549351 + ... + 549657.

Almost surely, 2^168697728 is an apocalyptic number.

168697728 is a gapful number since it is divisible by the number (18) 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 168697728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (256590180).

168697728 is an abundant number, since it is smaller than the sum of its proper divisors (344482632).

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

168697728 is an equidigital number, since it uses as much as digits as its factorization.

168697728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386 (or 365 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 54.

The square root of 168697728 is about 12988.3689507189. The cubic root of 168697728 is about 552.5476606237.

The spelling of 168697728 in words is "one hundred sixty-eight million, six hundred ninety-seven thousand, seven hundred twenty-eight".