996779668 has 24 divisors (see below), whose sum is σ = 1781238312. Its totient is φ = 487954944.

The previous prime is 996779647. The next prime is 996779687. The reversal of 996779668 is 866977699.

It can be written as a sum of positive squares in 4 ways, for example, as 288048784 + 708730884 = 16972^2 + 26622^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27546 + ... + 52462.

It is an arithmetic number, because the mean of its divisors is an integer number (74218263).

Almost surely, 2^996779668 is an apocalyptic number.

It is an amenable number.

996779668 is a deficient number, since it is larger than the sum of its proper divisors (784458644).

996779668 is a wasteful number, since it uses less digits than its factorization.

996779668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25131 (or 25129 counting only the distinct ones).

The product of its digits is 61725888, while the sum is 67.

The square root of 996779668 is about 31571.8176226837. The cubic root of 996779668 is about 998.9254016520.

The spelling of 996779668 in words is "nine hundred ninety-six million, seven hundred seventy-nine thousand, six hundred sixty-eight".