1728660318 has 128 divisors (see below), whose sum is σ = 4631040000. Its totient is φ = 425265120.

The previous prime is 1728660301. The next prime is 1728660331. The reversal of 1728660318 is 8130668271.

It is a super-2 number, since 2×1728660318² = 5976532990055722248, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 1728660318.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 428113 + ... + 432131.

It is an arithmetic number, because the mean of its divisors is an integer number (36180000).

Almost surely, 2^1728660318 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1728660318, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2315520000).

1728660318 is an abundant number, since it is smaller than the sum of its proper divisors (2902379682).

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

1728660318 is a wasteful number, since it uses less digits than its factorization.

1728660318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4075 (or 4061 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 1728660318 is about 41577.1610141914. The cubic root of 1728660318 is about 1200.1528319234.

The spelling of 1728660318 in words is "one billion, seven hundred twenty-eight million, six hundred sixty thousand, three hundred eighteen".