78871243 has 4 divisors (see below), whose sum is σ = 86041368. Its totient is φ = 71701120.

The previous prime is 78871207. The next prime is 78871267. The reversal of 78871243 is 34217887.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34217887 = 11 ⋅3110717.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78871243 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 78871196 and 78871205.

It is not an unprimeable number, because it can be changed into a prime (78871283) 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, 3585046 + ... + 3585067.

It is an arithmetic number, because the mean of its divisors is an integer number (21510342).

Almost surely, 2^78871243 is an apocalyptic number.

78871243 is a deficient number, since it is larger than the sum of its proper divisors (7170125).

78871243 is a wasteful number, since it uses less digits than its factorization.

78871243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7170124.

The product of its digits is 75264, while the sum is 40.

The square root of 78871243 is about 8880.9483164806. The cubic root of 78871243 is about 428.8508038161.

The spelling of 78871243 in words is "seventy-eight million, eight hundred seventy-one thousand, two hundred forty-three".