1728081906 has 16 divisors (see below), whose sum is σ = 3468920448. Its totient is φ = 573901200.

The previous prime is 1728081731. The next prime is 1728081913. The reversal of 1728081906 is 6091808271.

It is a Curzon 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, 529765 + ... + 533016.

It is an arithmetic number, because the mean of its divisors is an integer number (216807528).

Almost surely, 2^1728081906 is an apocalyptic number.

1728081906 is an abundant number, since it is smaller than the sum of its proper divisors (1740838542).

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

1728081906 is a wasteful number, since it uses less digits than its factorization.

1728081906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1063057.

The product of its (nonzero) digits is 48384, while the sum is 42.

The square root of 1728081906 is about 41570.2045460448. The cubic root of 1728081906 is about 1200.0189594227.

The spelling of 1728081906 in words is "one billion, seven hundred twenty-eight million, eighty-one thousand, nine hundred six".