78340187 has 4 divisors (see below), whose sum is σ = 78554016. Its totient is φ = 78126360.

The previous prime is 78340151. The next prime is 78340237. The reversal of 78340187 is 78104387.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78104387 = 3461 ⋅22567.

It is a cyclic number.

It is not a de Polignac number, because 78340187 - 2⁸ = 78339931 is a prime.

It is a super-2 number, since 2×78340187² = 12274369798389938, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78340187.

It is not an unprimeable number, because it can be changed into a prime (78340387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106364 + ... + 107097.

It is an arithmetic number, because the mean of its divisors is an integer number (19638504).

Almost surely, 2^78340187 is an apocalyptic number.

78340187 is a deficient number, since it is larger than the sum of its proper divisors (213829).

78340187 is a wasteful number, since it uses less digits than its factorization.

78340187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213828.

The product of its (nonzero) digits is 37632, while the sum is 38.

The square root of 78340187 is about 8850.9992091289. Note that the first 3 decimals coincide. The cubic root of 78340187 is about 427.8861224241.

The spelling of 78340187 in words is "seventy-eight million, three hundred forty thousand, one hundred eighty-seven".