78854171 has 4 divisors (see below), whose sum is σ = 86022744. Its totient is φ = 71685600.

The previous prime is 78854147. The next prime is 78854183. The reversal of 78854171 is 17145887.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17145887 = 11 ⋅1558717.

It is a cyclic number.

It is not a de Polignac number, because 78854171 - 2²² = 74659867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78854071) 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, 3584270 + ... + 3584291.

It is an arithmetic number, because the mean of its divisors is an integer number (21505686).

Almost surely, 2^78854171 is an apocalyptic number.

78854171 is a deficient number, since it is larger than the sum of its proper divisors (7168573).

78854171 is a wasteful number, since it uses less digits than its factorization.

78854171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7168572.

The product of its digits is 62720, while the sum is 41.

The square root of 78854171 is about 8879.9871058465. The cubic root of 78854171 is about 428.8198594188.

The spelling of 78854171 in words is "seventy-eight million, eight hundred fifty-four thousand, one hundred seventy-one".