161728774 has 8 divisors (see below), whose sum is σ = 244364328. Its totient is φ = 80274000.

The previous prime is 161728771. The next prime is 161728793. The reversal of 161728774 is 477827161.

161728774 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 161728774.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161728771) 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, 294852 + ... + 295399.

It is an arithmetic number, because the mean of its divisors is an integer number (30545541).

Almost surely, 2^161728774 is an apocalyptic number.

161728774 is a deficient number, since it is larger than the sum of its proper divisors (82635554).

161728774 is a wasteful number, since it uses less digits than its factorization.

161728774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 590390.

The product of its digits is 131712, while the sum is 43.

The square root of 161728774 is about 12717.2628344310. The cubic root of 161728774 is about 544.8317792971.

The spelling of 161728774 in words is "one hundred sixty-one million, seven hundred twenty-eight thousand, seven hundred seventy-four".