29927981768 has 16 divisors (see below), whose sum is σ = 57419965680. Its totient is φ = 14615990928.

The previous prime is 29927981767. The next prime is 29927981779. The reversal of 29927981768 is 86718972992.

It is a junction number, because it is equal to n+sod(n) for n = 29927981698 and 29927981707.

It is not an unprimeable number, because it can be changed into a prime (29927981761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43499630 + ... + 43500317.

It is an arithmetic number, because the mean of its divisors is an integer number (3588747855).

Almost surely, 2^29927981768 is an apocalyptic number.

It is an amenable number.

29927981768 is a deficient number, since it is larger than the sum of its proper divisors (27491983912).

29927981768 is a wasteful number, since it uses less digits than its factorization.

29927981768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86999996 (or 86999992 counting only the distinct ones).

The product of its digits is 54867456, while the sum is 68.

The spelling of 29927981768 in words is "twenty-nine billion, nine hundred twenty-seven million, nine hundred eighty-one thousand, seven hundred sixty-eight".