1681689768 has 32 divisors (see below), whose sum is σ = 4586427360. Its totient is φ = 509602880.

The previous prime is 1681689761. The next prime is 1681689769. The reversal of 1681689768 is 8679861861.

It is not an unprimeable number, because it can be changed into a prime (1681689761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3184755 + ... + 3185282.

It is an arithmetic number, because the mean of its divisors is an integer number (143325855).

Almost surely, 2^1681689768 is an apocalyptic number.

It is an amenable number.

1681689768 is an abundant number, since it is smaller than the sum of its proper divisors (2904737592).

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

1681689768 is a wasteful number, since it uses less digits than its factorization.

1681689768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6370057 (or 6370053 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 60.

The square root of 1681689768 is about 41008.4109421470. The cubic root of 1681689768 is about 1189.1828224405.

The spelling of 1681689768 in words is "one billion, six hundred eighty-one million, six hundred eighty-nine thousand, seven hundred sixty-eight".