165728858 has 16 divisors (see below), whose sum is σ = 251997480. Its totient is φ = 81734400.

The previous prime is 165728831. The next prime is 165728891. The reversal of 165728858 is 858827561.

It can be written as a sum of positive squares in 4 ways, for example, as 129572689 + 36156169 = 11383^2 + 6013^2 .

It is an unprimeable number.

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, 95438 + ... + 97158.

Almost surely, 2^165728858 is an apocalyptic number.

165728858 is a deficient number, since it is larger than the sum of its proper divisors (86268622).

165728858 is a wasteful number, since it uses less digits than its factorization.

165728858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2353.

The product of its digits is 1075200, while the sum is 50.

The square root of 165728858 is about 12873.5720761566. The cubic root of 165728858 is about 549.2870740802.

The spelling of 165728858 in words is "one hundred sixty-five million, seven hundred twenty-eight thousand, eight hundred fifty-eight".