1680871638 has 8 divisors (see below), whose sum is σ = 3361743288. Its totient is φ = 560290544.

The previous prime is 1680871541. The next prime is 1680871649. The reversal of 1680871638 is 8361780861.

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

1680871638 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140072631 + ... + 140072642.

It is an arithmetic number, because the mean of its divisors is an integer number (420217911).

Almost surely, 2^1680871638 is an apocalyptic number.

1680871638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1680871638 is a wasteful number, since it uses less digits than its factorization.

1680871638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280145278.

The product of its (nonzero) digits is 387072, while the sum is 48.

The square root of 1680871638 is about 40998.4345798715. The cubic root of 1680871638 is about 1188.9899481910.

The spelling of 1680871638 in words is "one billion, six hundred eighty million, eight hundred seventy-one thousand, six hundred thirty-eight".