78847379285 has 4 divisors (see below), whose sum is σ = 94616855148. Its totient is φ = 63077903424.

The previous prime is 78847379279. The next prime is 78847379293. The reversal of 78847379285 is 58297374887.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58297374887 = 68683 ⋅848789.

It can be written as a sum of positive squares in 2 ways, for example, as 11227097764 + 67620281521 = 105958^2 + 260039^2 .

It is a cyclic number.

It is not a de Polignac number, because 78847379285 - 2¹⁴ = 78847362901 is a prime.

It is a super-2 number, since 2×78847379285² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7884737924 + ... + 7884737933.

It is an arithmetic number, because the mean of its divisors is an integer number (23654213787).

Almost surely, 2^78847379285 is an apocalyptic number.

It is an amenable number.

78847379285 is a deficient number, since it is larger than the sum of its proper divisors (15769475863).

78847379285 is a wasteful number, since it uses less digits than its factorization.

78847379285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15769475862.

The product of its digits is 189665280, while the sum is 68.

The spelling of 78847379285 in words is "seventy-eight billion, eight hundred forty-seven million, three hundred seventy-nine thousand, two hundred eighty-five".