78684271 has 4 divisors (see below), whose sum is σ = 78953112. Its totient is φ = 78415432.

The previous prime is 78684257. The next prime is 78684299. The reversal of 78684271 is 17248687.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17248687 = 149 ⋅115763.

It is a cyclic number.

It is not a de Polignac number, because 78684271 - 2¹³ = 78676079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78684071) 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, 133981 + ... + 134566.

It is an arithmetic number, because the mean of its divisors is an integer number (19738278).

Almost surely, 2^78684271 is an apocalyptic number.

78684271 is a deficient number, since it is larger than the sum of its proper divisors (268841).

78684271 is a wasteful number, since it uses less digits than its factorization.

78684271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268840.

The product of its digits is 150528, while the sum is 43.

The square root of 78684271 is about 8870.4154919598. The cubic root of 78684271 is about 428.5116580825.

The spelling of 78684271 in words is "seventy-eight million, six hundred eighty-four thousand, two hundred seventy-one".