78813187 has 4 divisors (see below), whose sum is σ = 78842176. Its totient is φ = 78784200.

The previous prime is 78813181. The next prime is 78813211. The reversal of 78813187 is 78131887.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78131887 = 29 ⋅2694203.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78813187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78813181) 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, 9939 + ... + 16012.

It is an arithmetic number, because the mean of its divisors is an integer number (19710544).

Almost surely, 2^78813187 is an apocalyptic number.

78813187 is a deficient number, since it is larger than the sum of its proper divisors (28989).

78813187 is a wasteful number, since it uses less digits than its factorization.

78813187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28988.

The product of its digits is 75264, while the sum is 43.

The square root of 78813187 is about 8877.6791449117. The cubic root of 78813187 is about 428.7455543289.

The spelling of 78813187 in words is "seventy-eight million, eight hundred thirteen thousand, one hundred eighty-seven".