161761128 has 32 divisors (see below), whose sum is σ = 406095360. Its totient is φ = 53694720.

The previous prime is 161761099. The next prime is 161761129. The reversal of 161761128 is 821167161.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (161761129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8200 + ... + 19767.

It is an arithmetic number, because the mean of its divisors is an integer number (12690480).

Almost surely, 2^161761128 is an apocalyptic number.

It is an amenable number.

161761128 is an abundant number, since it is smaller than the sum of its proper divisors (244334232).

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

161761128 is a wasteful number, since it uses less digits than its factorization.

161761128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28217 (or 28213 counting only the distinct ones).

The product of its digits is 4032, while the sum is 33.

The square root of 161761128 is about 12718.5348212756. The cubic root of 161761128 is about 544.8681082521.

The spelling of 161761128 in words is "one hundred sixty-one million, seven hundred sixty-one thousand, one hundred twenty-eight".