168135728 has 10 divisors (see below), whose sum is σ = 325763004. Its totient is φ = 84067856.

The previous prime is 168135713. The next prime is 168135743. The reversal of 168135728 is 827531861.

It is an interprime number because it is at equal distance from previous prime (168135713) and next prime (168135743).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5254226 + ... + 5254257.

Almost surely, 2^168135728 is an apocalyptic number.

It is an amenable number.

168135728 is a deficient number, since it is larger than the sum of its proper divisors (157627276).

168135728 is a wasteful number, since it uses less digits than its factorization.

168135728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10508491 (or 10508485 counting only the distinct ones).

The product of its digits is 80640, while the sum is 41.

The square root of 168135728 is about 12966.7161610024. The cubic root of 168135728 is about 551.9333918089.

The spelling of 168135728 in words is "one hundred sixty-eight million, one hundred thirty-five thousand, seven hundred twenty-eight".