161910728 has 16 divisors (see below), whose sum is σ = 346951680. Its totient is φ = 69390288.

The previous prime is 161910719. The next prime is 161910733. The reversal of 161910728 is 827019161.

161910728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1445576 + ... + 1445687.

It is an arithmetic number, because the mean of its divisors is an integer number (21684480).

Almost surely, 2^161910728 is an apocalyptic number.

It is an amenable number.

161910728 is an abundant number, since it is smaller than the sum of its proper divisors (185040952).

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

161910728 is a wasteful number, since it uses less digits than its factorization.

161910728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2891276 (or 2891272 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 35.

The square root of 161910728 is about 12724.4146427252. The cubic root of 161910728 is about 545.0360248891.

Adding to 161910728 its reverse (827019161), we get a palindrome (988929889).

The spelling of 161910728 in words is "one hundred sixty-one million, nine hundred ten thousand, seven hundred twenty-eight".