78728642663 has 16 divisors (see below), whose sum is σ = 87008985600. Its totient is φ = 70636250880.

The previous prime is 78728642653. The next prime is 78728642689. The reversal of 78728642663 is 36624682787.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 78728642663 - 2⁴ = 78728642647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78728642653) 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, 2235848 + ... + 2270786.

It is an arithmetic number, because the mean of its divisors is an integer number (5438061600).

Almost surely, 2^78728642663 is an apocalyptic number.

78728642663 is a deficient number, since it is larger than the sum of its proper divisors (8280342937).

78728642663 is a wasteful number, since it uses less digits than its factorization.

78728642663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37622.

The product of its digits is 32514048, while the sum is 59.

The spelling of 78728642663 in words is "seventy-eight billion, seven hundred twenty-eight million, six hundred forty-two thousand, six hundred sixty-three".