78784938009 has 16 divisors (see below), whose sum is σ = 116723904000. Its totient is φ = 52520827248.

The previous prime is 78784937993. The next prime is 78784938031. The reversal of 78784938009 is 90083948787.

78784938009 is a `hidden beast` number, since 78 + 78 + 493 + 8 + 0 + 0 + 9 = 666.

It is not a de Polignac number, because 78784938009 - 2⁴ = 78784937993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78784938079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 657507 + ... + 768039.

It is an arithmetic number, because the mean of its divisors is an integer number (7295244000).

Almost surely, 2^78784938009 is an apocalyptic number.

It is an amenable number.

78784938009 is a deficient number, since it is larger than the sum of its proper divisors (37938965991).

78784938009 is a wasteful number, since it uses less digits than its factorization.

78784938009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136941 (or 136935 counting only the distinct ones).

The product of its (nonzero) digits is 24385536, while the sum is 63.

The spelling of 78784938009 in words is "seventy-eight billion, seven hundred eighty-four million, nine hundred thirty-eight thousand, nine".