168928861 has 8 divisors (see below), whose sum is σ = 172559160. Its totient is φ = 165315072.

The previous prime is 168928831. The next prime is 168928871. The reversal of 168928861 is 168829861.

It can be written as a sum of positive squares in 4 ways, for example, as 129163225 + 39765636 = 11365^2 + 6306^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 168928861 - 2¹³ = 168920669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168928831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17781 + ... + 25573.

It is an arithmetic number, because the mean of its divisors is an integer number (21569895).

Almost surely, 2^168928861 is an apocalyptic number.

It is an amenable number.

168928861 is a deficient number, since it is larger than the sum of its proper divisors (3630299).

168928861 is an equidigital number, since it uses as much as digits as its factorization.

168928861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8255.

The product of its digits is 331776, while the sum is 49.

The square root of 168928861 is about 12997.2635966191. The cubic root of 168928861 is about 552.7998942453.

The spelling of 168928861 in words is "one hundred sixty-eight million, nine hundred twenty-eight thousand, eight hundred sixty-one".