78715471 has 4 divisors (see below), whose sum is σ = 79198552. Its totient is φ = 78232392.

The previous prime is 78715451. The next prime is 78715477. The reversal of 78715471 is 17451787.

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 78715471 - 2²³ = 70326863 is a prime.

It is a super-3 number, since 3×78715471³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78715477) 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, 241296 + ... + 241621.

It is an arithmetic number, because the mean of its divisors is an integer number (19799638).

Almost surely, 2^78715471 is an apocalyptic number.

78715471 is a deficient number, since it is larger than the sum of its proper divisors (483081).

78715471 is a wasteful number, since it uses less digits than its factorization.

78715471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483080.

The product of its digits is 54880, while the sum is 40.

The square root of 78715471 is about 8872.1739725954. The cubic root of 78715471 is about 428.5682886172.

The spelling of 78715471 in words is "seventy-eight million, seven hundred fifteen thousand, four hundred seventy-one".