78421192647 has 24 divisors (see below), whose sum is σ = 122748793200. Its totient is φ = 44400980736.

The previous prime is 78421192631. The next prime is 78421192651. The reversal of 78421192647 is 74629112487.

It is not a de Polignac number, because 78421192647 - 2⁴ = 78421192631 is a prime.

It is a super-2 number, since 2×78421192647² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78421192647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78421192607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2431122 + ... + 2463167.

It is an arithmetic number, because the mean of its divisors is an integer number (5114533050).

Almost surely, 2^78421192647 is an apocalyptic number.

78421192647 is a deficient number, since it is larger than the sum of its proper divisors (44327600553).

78421192647 is a wasteful number, since it uses less digits than its factorization.

78421192647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4894415 (or 4894408 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 51.

The spelling of 78421192647 in words is "seventy-eight billion, four hundred twenty-one million, one hundred ninety-two thousand, six hundred forty-seven".