78847788664 has 16 divisors (see below), whose sum is σ = 148389197400. Its totient is φ = 39277336032.

The previous prime is 78847788653. The next prime is 78847788683. The reversal of 78847788664 is 46688774887.

It is a congruent number.

It is an unprimeable number.

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, 18317502 + ... + 18321805.

Almost surely, 2^78847788664 is an apocalyptic number.

It is an amenable number.

78847788664 is a deficient number, since it is larger than the sum of its proper divisors (69541408736).

78847788664 is a wasteful number, since it uses less digits than its factorization.

78847788664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36639582 (or 36639578 counting only the distinct ones).

The product of its digits is 809238528, while the sum is 73.

The spelling of 78847788664 in words is "seventy-eight billion, eight hundred forty-seven million, seven hundred eighty-eight thousand, six hundred sixty-four".