78247193187 has 4 divisors (see below), whose sum is σ = 104329590920. Its totient is φ = 52164795456.

The previous prime is 78247193179. The next prime is 78247193191. The reversal of 78247193187 is 78139174287.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 78247193187 - 2³ = 78247193179 is a prime.

It is a super-2 number, since 2×78247193187² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78247193107) 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, 13041198862 + ... + 13041198867.

It is an arithmetic number, because the mean of its divisors is an integer number (26082397730).

Almost surely, 2^78247193187 is an apocalyptic number.

78247193187 is a deficient number, since it is larger than the sum of its proper divisors (26082397733).

78247193187 is a wasteful number, since it uses less digits than its factorization.

78247193187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26082397732.

The product of its digits is 4741632, while the sum is 57.

The spelling of 78247193187 in words is "seventy-eight billion, two hundred forty-seven million, one hundred ninety-three thousand, one hundred eighty-seven".