1688608340 has 24 divisors (see below), whose sum is σ = 3573152352. Its totient is φ = 670286240.

The previous prime is 1688608297. The next prime is 1688608391. The reversal of 1688608340 is 438068861.

It is a junction number, because it is equal to n+sod(n) for n = 1688608291 and 1688608300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 319634 + ... + 324873.

It is an arithmetic number, because the mean of its divisors is an integer number (148881348).

Almost surely, 2^1688608340 is an apocalyptic number.

1688608340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1688608340 is an abundant number, since it is smaller than the sum of its proper divisors (1884544012).

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

1688608340 is a wasteful number, since it uses less digits than its factorization.

1688608340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644647 (or 644645 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 44.

The square root of 1688608340 is about 41092.6798834050. The cubic root of 1688608340 is about 1190.8113808338.

The spelling of 1688608340 in words is "one billion, six hundred eighty-eight million, six hundred eight thousand, three hundred forty".