1669273728 has 64 divisors (see below), whose sum is σ = 4667397600. Its totient is φ = 527136768.

The previous prime is 1669273721. The next prime is 1669273729. The reversal of 1669273728 is 8273729661.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (1669273721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107101 + ... + 121692.

Almost surely, 2^1669273728 is an apocalyptic number.

It is an amenable number.

1669273728 is an abundant number, since it is smaller than the sum of its proper divisors (2998123872).

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

1669273728 is a wasteful number, since it uses less digits than its factorization.

1669273728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228829 (or 228817 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 51.

The square root of 1669273728 is about 40856.7464196551. The cubic root of 1669273728 is about 1186.2489820382.

The spelling of 1669273728 in words is "one billion, six hundred sixty-nine million, two hundred seventy-three thousand, seven hundred twenty-eight".