161789128 has 16 divisors (see below), whose sum is σ = 305289180. Its totient is φ = 80378688.

The previous prime is 161789083. The next prime is 161789129. The reversal of 161789128 is 821987161.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 137405284 + 24383844 = 11722^2 + 4938^2 .

It is not an unprimeable number, because it can be changed into a prime (161789129) 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, 63151 + ... + 65662.

Almost surely, 2^161789128 is an apocalyptic number.

It is an amenable number.

161789128 is a deficient number, since it is larger than the sum of its proper divisors (143500052).

161789128 is a wasteful number, since it uses less digits than its factorization.

161789128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128976 (or 128972 counting only the distinct ones).

The product of its digits is 48384, while the sum is 43.

The square root of 161789128 is about 12719.6355293695. The cubic root of 161789128 is about 544.8995443725.

The spelling of 161789128 in words is "one hundred sixty-one million, seven hundred eighty-nine thousand, one hundred twenty-eight".