78748638749 has 8 divisors (see below), whose sum is σ = 86050554240. Its totient is φ = 71470548000.

The previous prime is 78748638737. The next prime is 78748638767. The reversal of 78748638749 is 94783684787.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78748638749 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78748638649) 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 7 ways as a sum of consecutive naturals, for example, 5949269 + ... + 5962490.

It is an arithmetic number, because the mean of its divisors is an integer number (10756319280).

Almost surely, 2^78748638749 is an apocalyptic number.

It is an amenable number.

78748638749 is a deficient number, since it is larger than the sum of its proper divisors (7301915491).

78748638749 is a wasteful number, since it uses less digits than its factorization.

78748638749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11912371.

The product of its digits is 455196672, while the sum is 71.

The spelling of 78748638749 in words is "seventy-eight billion, seven hundred forty-eight million, six hundred thirty-eight thousand, seven hundred forty-nine".