78345271 has 2 divisors, whose sum is σ = 78345272. Its totient is φ = 78345270.

The previous prime is 78345247. The next prime is 78345347. The reversal of 78345271 is 17254387.

It is a weak prime.

It is an emirp because it is prime and its reverse (17254387) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78345271 - 2⁷ = 78345143 is a prime.

It is a super-2 number, since 2×78345271² = 12275962976126882, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78345271.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78345221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39172635 + 39172636.

It is an arithmetic number, because the mean of its divisors is an integer number (39172636).

Almost surely, 2^78345271 is an apocalyptic number.

78345271 is a deficient number, since it is larger than the sum of its proper divisors (1).

78345271 is an equidigital number, since it uses as much as digits as its factorization.

78345271 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47040, while the sum is 37.

The square root of 78345271 is about 8851.2864036817. The cubic root of 78345271 is about 427.8953783207.

The spelling of 78345271 in words is "seventy-eight million, three hundred forty-five thousand, two hundred seventy-one".