1968691856 has 40 divisors (see below), whose sum is σ = 3927673464. Its totient is φ = 955238400.

The previous prime is 1968691849. The next prime is 1968691903. The reversal of 1968691856 is 6581968691.

It can be written as a sum of positive squares in 4 ways, for example, as 1039417600 + 929274256 = 32240^2 + 30484^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1968691795 and 1968691804.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 233246 + ... + 241538.

Almost surely, 2^1968691856 is an apocalyptic number.

1968691856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1968691856 is a deficient number, since it is larger than the sum of its proper divisors (1958981608).

1968691856 is a wasteful number, since it uses less digits than its factorization.

1968691856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8739 (or 8733 counting only the distinct ones).

The product of its digits is 5598720, while the sum is 59.

The square root of 1968691856 is about 44369.9431597562. The cubic root of 1968691856 is about 1253.3121452834.

The spelling of 1968691856 in words is "one billion, nine hundred sixty-eight million, six hundred ninety-one thousand, eight hundred fifty-six".