78870113 has 4 divisors (see below), whose sum is σ = 90137280. Its totient is φ = 67602948.

The previous prime is 78870073. The next prime is 78870167. The reversal of 78870113 is 31107887.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31107887 = 1667 ⋅18661.

It is a de Polignac number, because none of the positive numbers 2^k-78870113 is a prime.

It is a super-3 number, since 3×78870113³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78870173) 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, 5633573 + ... + 5633586.

It is an arithmetic number, because the mean of its divisors is an integer number (22534320).

Almost surely, 2^78870113 is an apocalyptic number.

It is an amenable number.

78870113 is a deficient number, since it is larger than the sum of its proper divisors (11267167).

78870113 is a wasteful number, since it uses less digits than its factorization.

78870113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11267166.

The product of its (nonzero) digits is 9408, while the sum is 35.

The square root of 78870113 is about 8880.8846969207. The cubic root of 78870113 is about 428.8487557366.

The spelling of 78870113 in words is "seventy-eight million, eight hundred seventy thousand, one hundred thirteen".