1728863668 has 18 divisors (see below), whose sum is σ = 3519472866. Its totient is φ = 740941488.

The previous prime is 1728863663. The next prime is 1728863753. The reversal of 1728863668 is 8663688271.

It can be written as a sum of positive squares in only one way, i.e., 1388903824 + 339959844 = 37268^2 + 18438^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1728863663) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4410171 + ... + 4410562.

Almost surely, 2^1728863668 is an apocalyptic number.

It is an amenable number.

1728863668 is an abundant number, since it is smaller than the sum of its proper divisors (1790609198).

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

1728863668 is a wasteful number, since it uses less digits than its factorization.

1728863668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8820751 (or 8820742 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 55.

The square root of 1728863668 is about 41579.6063954434. The cubic root of 1728863668 is about 1200.1998898497.

The spelling of 1728863668 in words is "one billion, seven hundred twenty-eight million, eight hundred sixty-three thousand, six hundred sixty-eight".