78108271 has 4 divisors (see below), whose sum is σ = 79432200. Its totient is φ = 76784344.

The previous prime is 78108263. The next prime is 78108301. The reversal of 78108271 is 17280187.

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

It is a cyclic number.

It is not a de Polignac number, because 78108271 - 2³ = 78108263 is a prime.

It is a super-2 number, since 2×78108271² = 12201803997218882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78108241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 661876 + ... + 661993.

It is an arithmetic number, because the mean of its divisors is an integer number (19858050).

Almost surely, 2^78108271 is an apocalyptic number.

78108271 is a deficient number, since it is larger than the sum of its proper divisors (1323929).

78108271 is a wasteful number, since it uses less digits than its factorization.

78108271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1323928.

The product of its (nonzero) digits is 6272, while the sum is 34.

The square root of 78108271 is about 8837.8883790191. Note that the first 3 decimals coincide. The cubic root of 78108271 is about 427.4634712242.

The spelling of 78108271 in words is "seventy-eight million, one hundred eight thousand, two hundred seventy-one".