78478471 has 2 divisors, whose sum is σ = 78478472. Its totient is φ = 78478470.

The previous prime is 78478457. The next prime is 78478489. The reversal of 78478471 is 17487487.

It is a weak prime.

It is an emirp because it is prime and its reverse (17487487) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78478471 - 2⁷ = 78478343 is a prime.

It is a super-3 number, since 3×78478471³ (a number of 25 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78478441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39239235 + 39239236.

It is an arithmetic number, because the mean of its divisors is an integer number (39239236).

Almost surely, 2^78478471 is an apocalyptic number.

78478471 is a deficient number, since it is larger than the sum of its proper divisors (1).

78478471 is an equidigital number, since it uses as much as digits as its factorization.

78478471 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 351232, while the sum is 46.

The square root of 78478471 is about 8858.8075382638. The cubic root of 78478471 is about 428.1377388079.

The spelling of 78478471 in words is "seventy-eight million, four hundred seventy-eight thousand, four hundred seventy-one".