1688641982 has 8 divisors (see below), whose sum is σ = 2614671552. Its totient is φ = 817084800.

The previous prime is 1688641979. The next prime is 1688642027. The reversal of 1688641982 is 2891468861.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 13618019 + ... + 13618142.

It is an arithmetic number, because the mean of its divisors is an integer number (326833944).

Almost surely, 2^1688641982 is an apocalyptic number.

1688641982 is a deficient number, since it is larger than the sum of its proper divisors (926029570).

1688641982 is a wasteful number, since it uses less digits than its factorization.

1688641982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27236194.

The product of its digits is 1327104, while the sum is 53.

The square root of 1688641982 is about 41093.0892243453. The cubic root of 1688641982 is about 1190.8192889258.

The spelling of 1688641982 in words is "one billion, six hundred eighty-eight million, six hundred forty-one thousand, nine hundred eighty-two".