167728565 has 4 divisors (see below), whose sum is σ = 201274284. Its totient is φ = 134182848.

The previous prime is 167728559. The next prime is 167728609. The reversal of 167728565 is 565827761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 565827761 = 23 ⋅24601207.

It can be written as a sum of positive squares in 2 ways, for example, as 76755121 + 90973444 = 8761^2 + 9538^2 .

It is a cyclic number.

It is not a de Polignac number, because 167728565 - 2¹⁰ = 167727541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16772852 + ... + 16772861.

It is an arithmetic number, because the mean of its divisors is an integer number (50318571).

Almost surely, 2^167728565 is an apocalyptic number.

It is an amenable number.

167728565 is a deficient number, since it is larger than the sum of its proper divisors (33545719).

167728565 is an equidigital number, since it uses as much as digits as its factorization.

167728565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33545718.

The product of its digits is 705600, while the sum is 47.

The square root of 167728565 is about 12951.0063315559. The cubic root of 167728565 is about 551.4875050151.

The spelling of 167728565 in words is "one hundred sixty-seven million, seven hundred twenty-eight thousand, five hundred sixty-five".