78823938817 has 16 divisors (see below), whose sum is σ = 86477751360. Its totient is φ = 71401665600.

The previous prime is 78823938803. The next prime is 78823938881. The reversal of 78823938817 is 71883932887.

It is a cyclic number.

It is not a de Polignac number, because 78823938817 - 2¹⁹ = 78823414529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78823938887) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 347967 + ... + 527947.

It is an arithmetic number, because the mean of its divisors is an integer number (5404859460).

Almost surely, 2^78823938817 is an apocalyptic number.

It is an amenable number.

78823938817 is a deficient number, since it is larger than the sum of its proper divisors (7653812543).

78823938817 is a wasteful number, since it uses less digits than its factorization.

78823938817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180624.

The product of its digits is 32514048, while the sum is 64.

The spelling of 78823938817 in words is "seventy-eight billion, eight hundred twenty-three million, nine hundred thirty-eight thousand, eight hundred seventeen".