1669809028 has 12 divisors (see below), whose sum is σ = 2941778700. Its totient is φ = 829300832.

The previous prime is 1669809013. The next prime is 1669809073. The reversal of 1669809028 is 8209089661.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 225961024 + 1443848004 = 15032^2 + 37998^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1400251 + ... + 1401442.

It is an arithmetic number, because the mean of its divisors is an integer number (245148225).

Almost surely, 2^1669809028 is an apocalyptic number.

It is an amenable number.

1669809028 is a deficient number, since it is larger than the sum of its proper divisors (1271969672).

1669809028 is a wasteful number, since it uses less digits than its factorization.

1669809028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2801846 (or 2801844 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 49.

The square root of 1669809028 is about 40863.2968322430. The cubic root of 1669809028 is about 1186.3757699549.

The spelling of 1669809028 in words is "one billion, six hundred sixty-nine million, eight hundred nine thousand, twenty-eight".