168731648 has 44 divisors (see below), whose sum is σ = 343773180. Its totient is φ = 82747392.

The previous prime is 168731603. The next prime is 168731653. The reversal of 168731648 is 846137861.

It can be written as a sum of positive squares in 2 ways, for example, as 74097664 + 94633984 = 8608^2 + 9728^2 .

It is a junction number, because it is equal to n+sod(n) for n = 168731599 and 168731608.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52718 + ... + 55826.

Almost surely, 2^168731648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 168731648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (171886590).

168731648 is an abundant number, since it is smaller than the sum of its proper divisors (175041532).

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

168731648 is an equidigital number, since it uses as much as digits as its factorization.

168731648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3182 (or 3164 counting only the distinct ones).

The product of its digits is 193536, while the sum is 44.

The square root of 168731648 is about 12989.6746687513. The cubic root of 168731648 is about 552.5846916710.

The spelling of 168731648 in words is "one hundred sixty-eight million, seven hundred thirty-one thousand, six hundred forty-eight".