78724129215 has 16 divisors (see below), whose sum is σ = 126144677088. Its totient is φ = 41924178816.

The previous prime is 78724129189. The next prime is 78724129241. The reversal of 78724129215 is 51292142787.

78724129215 is digitally balanced in base 11, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (78724129189) and next prime (78724129241).

It is not a de Polignac number, because 78724129215 - 2¹² = 78724125119 is a prime.

78724129215 is strictly pandigital in base 11.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 3865972 + ... + 3886281.

It is an arithmetic number, because the mean of its divisors is an integer number (7884042318).

Almost surely, 2^78724129215 is an apocalyptic number.

78724129215 is a deficient number, since it is larger than the sum of its proper divisors (47420547873).

78724129215 is a wasteful number, since it uses less digits than its factorization.

78724129215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7752938.

The product of its digits is 564480, while the sum is 48.

The spelling of 78724129215 in words is "seventy-eight billion, seven hundred twenty-four million, one hundred twenty-nine thousand, two hundred fifteen".