1665939828 has 36 divisors (see below), whose sum is σ = 4521838272. Its totient is φ = 475982640.

The previous prime is 1665939823. The next prime is 1665939833. The reversal of 1665939828 is 8289395661.

It is an interprime number because it is at equal distance from previous prime (1665939823) and next prime (1665939833).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665939823) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1416028 + ... + 1417203.

Almost surely, 2^1665939828 is an apocalyptic number.

It is an amenable number.

1665939828 is an abundant number, since it is smaller than the sum of its proper divisors (2855898444).

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

1665939828 is a wasteful number, since it uses less digits than its factorization.

1665939828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2833252 (or 2833243 counting only the distinct ones).

The product of its digits is 5598720, while the sum is 57.

The square root of 1665939828 is about 40815.9261563425. The cubic root of 1665939828 is about 1185.4587239303.

The spelling of 1665939828 in words is "one billion, six hundred sixty-five million, nine hundred thirty-nine thousand, eight hundred twenty-eight".