78655271 has 4 divisors (see below), whose sum is σ = 78715872. Its totient is φ = 78594672.

The previous prime is 78655267. The next prime is 78655309. The reversal of 78655271 is 17255687.

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 78655271 - 2² = 78655267 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 (78655771) 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, 28310 + ... + 30963.

It is an arithmetic number, because the mean of its divisors is an integer number (19678968).

Almost surely, 2^78655271 is an apocalyptic number.

78655271 is a deficient number, since it is larger than the sum of its proper divisors (60601).

78655271 is a wasteful number, since it uses less digits than its factorization.

78655271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60600.

The product of its digits is 117600, while the sum is 41.

The square root of 78655271 is about 8868.7806940977. The cubic root of 78655271 is about 428.4590073010.

The spelling of 78655271 in words is "seventy-eight million, six hundred fifty-five thousand, two hundred seventy-one".