168673638 has 16 divisors (see below), whose sum is σ = 385539840. Its totient is φ = 48192456.

The previous prime is 168673633. The next prime is 168673663. The reversal of 168673638 is 836376861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168673633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2007978 + ... + 2008061.

It is an arithmetic number, because the mean of its divisors is an integer number (24096240).

Almost surely, 2^168673638 is an apocalyptic number.

168673638 is an abundant number, since it is smaller than the sum of its proper divisors (216866202).

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

168673638 is a wasteful number, since it uses less digits than its factorization.

168673638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4016051.

The product of its digits is 870912, while the sum is 48.

The square root of 168673638 is about 12987.4415494354. The cubic root of 168673638 is about 552.5213581419.

The spelling of 168673638 in words is "one hundred sixty-eight million, six hundred seventy-three thousand, six hundred thirty-eight".