161856928 has 24 divisors (see below), whose sum is σ = 321172992. Its totient is φ = 80289216.

The previous prime is 161856923. The next prime is 161856931. The reversal of 161856928 is 829658161.

161856928 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (161856923) 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, 15850 + ... + 23977.

It is an arithmetic number, because the mean of its divisors is an integer number (13382208).

Almost surely, 2^161856928 is an apocalyptic number.

It is an amenable number.

161856928 is a deficient number, since it is larger than the sum of its proper divisors (159316064).

161856928 is a wasteful number, since it uses less digits than its factorization.

161856928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39964 (or 39956 counting only the distinct ones).

The product of its digits is 207360, while the sum is 46.

The square root of 161856928 is about 12722.3004209145. The cubic root of 161856928 is about 544.9756496710.

The spelling of 161856928 in words is "one hundred sixty-one million, eight hundred fifty-six thousand, nine hundred twenty-eight".