78838029799 has 4 divisors (see below), whose sum is σ = 78840746280. Its totient is φ = 78835313320.

The previous prime is 78838029763. The next prime is 78838029827. The reversal of 78838029799 is 99792083887.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99792083887 = 3947 ⋅25283021.

It is a cyclic number.

It is not a de Polignac number, because 78838029799 - 2¹⁹ = 78837505511 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 (78838029709) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1314232 + ... + 1372909.

It is an arithmetic number, because the mean of its divisors is an integer number (19710186570).

Almost surely, 2^78838029799 is an apocalyptic number.

78838029799 is a deficient number, since it is larger than the sum of its proper divisors (2716481).

78838029799 is a wasteful number, since it uses less digits than its factorization.

78838029799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2716480.

The product of its (nonzero) digits is 109734912, while the sum is 70.

The spelling of 78838029799 in words is "seventy-eight billion, eight hundred thirty-eight million, twenty-nine thousand, seven hundred ninety-nine".