68387998936 has 8 divisors (see below), whose sum is σ = 128227498020. Its totient is φ = 34193999464.

The previous prime is 68387998933. The next prime is 68387998997. The reversal of 68387998936 is 63989978386.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68387998933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4274249926 + ... + 4274249941.

Almost surely, 2^68387998936 is an apocalyptic number.

It is an amenable number.

68387998936 is a deficient number, since it is larger than the sum of its proper divisors (59839499084).

68387998936 is a wasteful number, since it uses less digits than its factorization.

68387998936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8548499873 (or 8548499869 counting only the distinct ones).

The product of its digits is 846526464, while the sum is 76.

The spelling of 68387998936 in words is "sixty-eight billion, three hundred eighty-seven million, nine hundred ninety-eight thousand, nine hundred thirty-six".