1687268728 has 16 divisors (see below), whose sum is σ = 3203676000. Its totient is φ = 832955136.

The previous prime is 1687268711. The next prime is 1687268741. The reversal of 1687268728 is 8278627861.

It is a super-3 number, since 3×1687268728³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

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, 1334233 + ... + 1335496.

It is an arithmetic number, because the mean of its divisors is an integer number (200229750).

Almost surely, 2^1687268728 is an apocalyptic number.

It is an amenable number.

1687268728 is a deficient number, since it is larger than the sum of its proper divisors (1516407272).

1687268728 is a wasteful number, since it uses less digits than its factorization.

1687268728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2669814 (or 2669810 counting only the distinct ones).

The product of its digits is 3612672, while the sum is 55.

The square root of 1687268728 is about 41076.3767632930. The cubic root of 1687268728 is about 1190.4963981334.

The spelling of 1687268728 in words is "one billion, six hundred eighty-seven million, two hundred sixty-eight thousand, seven hundred twenty-eight".