165728740 has 12 divisors (see below), whose sum is σ = 348030396. Its totient is φ = 66291488.

The previous prime is 165728737. The next prime is 165728747. The reversal of 165728740 is 47827561.

It can be written as a sum of positive squares in 2 ways, for example, as 91355364 + 74373376 = 9558^2 + 8624^2 .

It is a junction number, because it is equal to n+sod(n) for n = 165728693 and 165728702.

It is not an unprimeable number, because it can be changed into a prime (165728747) 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 3 ways as a sum of consecutive naturals, for example, 4143199 + ... + 4143238.

It is an arithmetic number, because the mean of its divisors is an integer number (29002533).

Almost surely, 2^165728740 is an apocalyptic number.

165728740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165728740 is an abundant number, since it is smaller than the sum of its proper divisors (182301656).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165728740 is a wasteful number, since it uses less digits than its factorization.

165728740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8286446 (or 8286444 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 40.

The square root of 165728740 is about 12873.5674931233. The cubic root of 165728740 is about 549.2869437149.

The spelling of 165728740 in words is "one hundred sixty-five million, seven hundred twenty-eight thousand, seven hundred forty".