1669366728 has 24 divisors (see below), whose sum is σ = 4521201750. Its totient is φ = 556455552.

The previous prime is 1669366723. The next prime is 1669366729. The reversal of 1669366728 is 8276639661.

It can be written as a sum of positive squares in only one way, i.e., 931592484 + 737774244 = 30522^2 + 27162^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (1669366723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11592753 + ... + 11592896.

Almost surely, 2^1669366728 is an apocalyptic number.

1669366728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1669366728 is an abundant number, since it is smaller than the sum of its proper divisors (2851835022).

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

1669366728 is a wasteful number, since it uses less digits than its factorization.

1669366728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23185661 (or 23185654 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 54.

The square root of 1669366728 is about 40857.8845267349. The cubic root of 1669366728 is about 1186.2710114003.

The spelling of 1669366728 in words is "one billion, six hundred sixty-nine million, three hundred sixty-six thousand, seven hundred twenty-eight".