78415471 has 2 divisors, whose sum is σ = 78415472. Its totient is φ = 78415470.

The previous prime is 78415433. The next prime is 78415483. The reversal of 78415471 is 17451487.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78415471 - 2⁷ = 78415343 is a prime.

It is a super-3 number, since 3×78415471³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 78415471.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78415871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39207735 + 39207736.

It is an arithmetic number, because the mean of its divisors is an integer number (39207736).

Almost surely, 2^78415471 is an apocalyptic number.

78415471 is a deficient number, since it is larger than the sum of its proper divisors (1).

78415471 is an equidigital number, since it uses as much as digits as its factorization.

78415471 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31360, while the sum is 37.

The square root of 78415471 is about 8855.2510410490. The cubic root of 78415471 is about 428.0231430552.

The spelling of 78415471 in words is "seventy-eight million, four hundred fifteen thousand, four hundred seventy-one".