1689641648 has 20 divisors (see below), whose sum is σ = 3318527928. Its totient is φ = 833247360.

The previous prime is 1689641627. The next prime is 1689641683. The reversal of 1689641648 is 8461469861.

It is a self number, because there is not a number n which added to its sum of digits gives 1689641648.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 722138 + ... + 724473.

Almost surely, 2^1689641648 is an apocalyptic number.

It is an amenable number.

1689641648 is a deficient number, since it is larger than the sum of its proper divisors (1628886280).

1689641648 is a wasteful number, since it uses less digits than its factorization.

1689641648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1446692 (or 1446686 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 53.

The square root of 1689641648 is about 41105.2508567944. The cubic root of 1689641648 is about 1191.0542285474.

The spelling of 1689641648 in words is "one billion, six hundred eighty-nine million, six hundred forty-one thousand, six hundred forty-eight".