162728909 has 4 divisors (see below), whose sum is σ = 185975904. Its totient is φ = 139481916.

The previous prime is 162728873. The next prime is 162728941. The reversal of 162728909 is 909827261.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 162728909 - 2⁸ = 162728653 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 162728909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (162728989) 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, 11623487 + ... + 11623500.

It is an arithmetic number, because the mean of its divisors is an integer number (46493976).

Almost surely, 2^162728909 is an apocalyptic number.

It is an amenable number.

162728909 is a deficient number, since it is larger than the sum of its proper divisors (23246995).

162728909 is an equidigital number, since it uses as much as digits as its factorization.

162728909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23246994.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 162728909 is about 12756.5241739276. The cubic root of 162728909 is about 545.9525568495.

The spelling of 162728909 in words is "one hundred sixty-two million, seven hundred twenty-eight thousand, nine hundred nine".