168728687 has 4 divisors (see below), whose sum is σ = 170468256. Its totient is φ = 166989120.

The previous prime is 168728671. The next prime is 168728701. The reversal of 168728687 is 786827861.

It is a happy number.

168728687 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 786827861 = 23 ⋅34209907.

It is a cyclic number.

It is not a de Polignac number, because 168728687 - 2⁴ = 168728671 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 (168728647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 869639 + ... + 869832.

It is an arithmetic number, because the mean of its divisors is an integer number (42617064).

Almost surely, 2^168728687 is an apocalyptic number.

168728687 is a deficient number, since it is larger than the sum of its proper divisors (1739569).

168728687 is an equidigital number, since it uses as much as digits as its factorization.

168728687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1739568.

The product of its digits is 1806336, while the sum is 53.

The square root of 168728687 is about 12989.5606931104. The cubic root of 168728687 is about 552.5814592941.

The spelling of 168728687 in words is "one hundred sixty-eight million, seven hundred twenty-eight thousand, six hundred eighty-seven".