168721077 has 32 divisors (see below), whose sum is σ = 269475840. Its totient is φ = 91808640.

The previous prime is 168721067. The next prime is 168721079. The reversal of 168721077 is 770127861.

It is not a de Polignac number, because 168721077 - 2²⁴ = 151943861 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168721079) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 130249 + ... + 131537.

It is an arithmetic number, because the mean of its divisors is an integer number (8421120).

Almost surely, 2^168721077 is an apocalyptic number.

It is an amenable number.

168721077 is a deficient number, since it is larger than the sum of its proper divisors (100754763).

168721077 is a wasteful number, since it uses less digits than its factorization.

168721077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1593.

The product of its (nonzero) digits is 32928, while the sum is 39.

The square root of 168721077 is about 12989.2677622721. The cubic root of 168721077 is about 552.5731516609.

The spelling of 168721077 in words is "one hundred sixty-eight million, seven hundred twenty-one thousand, seventy-seven".