1996978568 has 16 divisors (see below), whose sum is σ = 4032360780. Its totient is φ = 921682368.

The previous prime is 1996978567. The next prime is 1996978579. The reversal of 1996978568 is 8658796991.

It can be written as a sum of positive squares in 2 ways, for example, as 1389947524 + 607031044 = 37282^2 + 24638^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1996978498 and 1996978507.

It is not an unprimeable number, because it can be changed into a prime (1996978561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9600755 + ... + 9600962.

Almost surely, 2^1996978568 is an apocalyptic number.

It is an amenable number.

1996978568 is an abundant number, since it is smaller than the sum of its proper divisors (2035382212).

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

1996978568 is a wasteful number, since it uses less digits than its factorization.

1996978568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19201736 (or 19201732 counting only the distinct ones).

The product of its digits is 58786560, while the sum is 68.

The square root of 1996978568 is about 44687.5661454056. The cubic root of 1996978568 is about 1259.2862691667.

The spelling of 1996978568 in words is "one billion, nine hundred ninety-six million, nine hundred seventy-eight thousand, five hundred sixty-eight".