161890980 has 24 divisors (see below), whose sum is σ = 453294912. Its totient is φ = 43170912.

The previous prime is 161890973. The next prime is 161891003. The reversal of 161890980 is 89098161.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1349032 + ... + 1349151.

It is an arithmetic number, because the mean of its divisors is an integer number (18887288).

Almost surely, 2^161890980 is an apocalyptic number.

161890980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161890980 is an abundant number, since it is smaller than the sum of its proper divisors (291403932).

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

161890980 is a wasteful number, since it uses less digits than its factorization.

161890980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2698195 (or 2698193 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 42.

The square root of 161890980 is about 12723.6386305176. The cubic root of 161890980 is about 545.0138649224.

The spelling of 161890980 in words is "one hundred sixty-one million, eight hundred ninety thousand, nine hundred eighty".