161728406 has 16 divisors (see below), whose sum is σ = 284742816. Its totient is φ = 67438656.

The previous prime is 161728393. The next prime is 161728417. The reversal of 161728406 is 604827161.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155591 + ... + 156626.

It is an arithmetic number, because the mean of its divisors is an integer number (17796426).

Almost surely, 2^161728406 is an apocalyptic number.

161728406 is a deficient number, since it is larger than the sum of its proper divisors (123014410).

161728406 is a wasteful number, since it uses less digits than its factorization.

161728406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312263.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 161728406 is about 12717.2483659005. The cubic root of 161728406 is about 544.8313660574.

The spelling of 161728406 in words is "one hundred sixty-one million, seven hundred twenty-eight thousand, four hundred six".