1728164646 has 80 divisors (see below), whose sum is σ = 4389831600. Its totient is φ = 503744832.

The previous prime is 1728164623. The next prime is 1728164677. The reversal of 1728164646 is 6464618271.

1728164646 is a `hidden beast` number, since 172 + 8 + 16 + 464 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 18420 + ... + 61608.

It is an arithmetic number, because the mean of its divisors is an integer number (54872895).

Almost surely, 2^1728164646 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1728164646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2194915800).

1728164646 is an abundant number, since it is smaller than the sum of its proper divisors (2661666954).

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

1728164646 is a wasteful number, since it uses less digits than its factorization.

1728164646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43235 (or 43226 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 1728164646 is about 41571.1997180741. The cubic root of 1728164646 is about 1200.0381112896.

The spelling of 1728164646 in words is "one billion, seven hundred twenty-eight million, one hundred sixty-four thousand, six hundred forty-six".