78471447 has 8 divisors (see below), whose sum is σ = 108003840. Its totient is φ = 50626680.

The previous prime is 78471433. The next prime is 78471451. The reversal of 78471447 is 74417487.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78471447 - 2⁷ = 78471319 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78471399 and 78471408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78471427) 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 7 ways as a sum of consecutive naturals, for example, 421797 + ... + 421982.

It is an arithmetic number, because the mean of its divisors is an integer number (13500480).

Almost surely, 2^78471447 is an apocalyptic number.

78471447 is a deficient number, since it is larger than the sum of its proper divisors (29532393).

78471447 is a wasteful number, since it uses less digits than its factorization.

78471447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843813.

The product of its digits is 175616, while the sum is 42.

The square root of 78471447 is about 8858.4110877742. The cubic root of 78471447 is about 428.1249653294.

The spelling of 78471447 in words is "seventy-eight million, four hundred seventy-one thousand, four hundred forty-seven".