999956768 has 24 divisors (see below), whose sum is σ = 1969987068. Its totient is φ = 499642624.

The previous prime is 999956767. The next prime is 999956773. The reversal of 999956768 is 867659999.

It can be written as a sum of positive squares in 2 ways, for example, as 997801744 + 2155024 = 31588^2 + 1468^2 .

It is a junction number, because it is equal to n+sod(n) for n = 999956698 and 999956707.

It is not an unprimeable number, because it can be changed into a prime (999956761) 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, 41930 + ... + 61302.

Almost surely, 2^999956768 is an apocalyptic number.

It is an amenable number.

999956768 is a deficient number, since it is larger than the sum of its proper divisors (970030300).

999956768 is a wasteful number, since it uses less digits than its factorization.

999956768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20996 (or 20988 counting only the distinct ones).

The product of its digits is 66134880, while the sum is 68.

The square root of 999956768 is about 31622.0930363567. The cubic root of 999956768 is about 999.9855891257.

The spelling of 999956768 in words is "nine hundred ninety-nine million, nine hundred fifty-six thousand, seven hundred sixty-eight".