1668020032 has 112 divisors (see below), whose sum is σ = 4015882240. Its totient is φ = 671473152.

The previous prime is 1668020021. The next prime is 1668020033. The reversal of 1668020032 is 2300208661.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668020033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1080253 + ... + 1081795.

Almost surely, 2^1668020032 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1668020032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2007941120).

1668020032 is an abundant number, since it is smaller than the sum of its proper divisors (2347862208).

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

1668020032 is a wasteful number, since it uses less digits than its factorization.

1668020032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1708 (or 1698 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 1668020032 is about 40841.4009554031. The cubic root of 1668020032 is about 1185.9519330781.

Adding to 1668020032 its reverse (2300208661), we get a palindrome (3968228693).

The spelling of 1668020032 in words is "one billion, six hundred sixty-eight million, twenty thousand, thirty-two".