78478621871 has 8 divisors (see below), whose sum is σ = 84524359920. Its totient is φ = 72434158272.

The previous prime is 78478621853. The next prime is 78478621937. The reversal of 78478621871 is 17812687487.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 78478621871 - 2¹⁴ = 78478605487 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78478621871.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78478621831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188750 + ... + 438843.

It is an arithmetic number, because the mean of its divisors is an integer number (10565544990).

Almost surely, 2^78478621871 is an apocalyptic number.

78478621871 is a deficient number, since it is larger than the sum of its proper divisors (6045738049).

78478621871 is a wasteful number, since it uses less digits than its factorization.

78478621871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637225.

The product of its digits is 8429568, while the sum is 59.

The spelling of 78478621871 in words is "seventy-eight billion, four hundred seventy-eight million, six hundred twenty-one thousand, eight hundred seventy-one".