1689734660 has 12 divisors (see below), whose sum is σ = 3548442828. Its totient is φ = 675893856.

The previous prime is 1689734653. The next prime is 1689734663. The reversal of 1689734660 is 664379861.

It can be written as a sum of positive squares in 2 ways, for example, as 949132864 + 740601796 = 30808^2 + 27214^2 .

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1689734599 and 1689734608.

It is not an unprimeable number, because it can be changed into a prime (1689734663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42243347 + ... + 42243386.

It is an arithmetic number, because the mean of its divisors is an integer number (295703569).

Almost surely, 2^1689734660 is an apocalyptic number.

1689734660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1689734660 is an abundant number, since it is smaller than the sum of its proper divisors (1858708168).

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

1689734660 is a wasteful number, since it uses less digits than its factorization.

1689734660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84486742 (or 84486740 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 50.

The square root of 1689734660 is about 41106.3822295273. The cubic root of 1689734660 is about 1191.0760833400.

The spelling of 1689734660 in words is "one billion, six hundred eighty-nine million, seven hundred thirty-four thousand, six hundred sixty".