1688333364 has 18 divisors (see below), whose sum is σ = 4267731650. Its totient is φ = 562777776.

The previous prime is 1688333357. The next prime is 1688333401. The reversal of 1688333364 is 4633338861.

It can be written as a sum of positive squares in only one way, i.e., 1213964964 + 474368400 = 34842^2 + 21780^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23449039 + ... + 23449110.

Almost surely, 2^1688333364 is an apocalyptic number.

It is an amenable number.

1688333364 is an abundant number, since it is smaller than the sum of its proper divisors (2579398286).

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

1688333364 is a wasteful number, since it uses less digits than its factorization.

1688333364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46898159 (or 46898154 counting only the distinct ones).

The product of its digits is 746496, while the sum is 45.

The square root of 1688333364 is about 41089.3339444679. Note that the first 3 decimals coincide. The cubic root of 1688333364 is about 1190.7467393737.

The spelling of 1688333364 in words is "one billion, six hundred eighty-eight million, three hundred thirty-three thousand, three hundred sixty-four".