168721630 has 32 divisors (see below), whose sum is σ = 378639360. Its totient is φ = 52588320.

The previous prime is 168721627. The next prime is 168721649. The reversal of 168721630 is 36127861.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108790 + ... + 110329.

It is an arithmetic number, because the mean of its divisors is an integer number (11832480).

Almost surely, 2^168721630 is an apocalyptic number.

168721630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

168721630 is an abundant number, since it is smaller than the sum of its proper divisors (209917730).

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

168721630 is a wasteful number, since it uses less digits than its factorization.

168721630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219144.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 168721630 is about 12989.2890490588. The cubic root of 168721630 is about 552.5737553646.

The spelling of 168721630 in words is "one hundred sixty-eight million, seven hundred twenty-one thousand, six hundred thirty".