1688211980 has 72 divisors (see below), whose sum is σ = 4387414752. Its totient is φ = 534283776.

The previous prime is 1688211971. The next prime is 1688212033. The reversal of 1688211980 is 891128861.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12017 + ... + 59336.

It is an arithmetic number, because the mean of its divisors is an integer number (60936316).

Almost surely, 2^1688211980 is an apocalyptic number.

1688211980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1688211980 is an abundant number, since it is smaller than the sum of its proper divisors (2699202772).

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

1688211980 is a wasteful number, since it uses less digits than its factorization.

1688211980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71395 (or 71380 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 44.

The square root of 1688211980 is about 41087.8568435980. The cubic root of 1688211980 is about 1190.7182021450.

The spelling of 1688211980 in words is "one billion, six hundred eighty-eight million, two hundred eleven thousand, nine hundred eighty".