78715237215 has 32 divisors (see below), whose sum is σ = 128551790016. Its totient is φ = 41115176960.

The previous prime is 78715237213. The next prime is 78715237331. The reversal of 78715237215 is 51273251787.

It is a happy number.

It is not a de Polignac number, because 78715237215 - 2¹ = 78715237213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78715237213) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 353935 + ... + 531695.

It is an arithmetic number, because the mean of its divisors is an integer number (4017243438).

Almost surely, 2^78715237215 is an apocalyptic number.

78715237215 is a deficient number, since it is larger than the sum of its proper divisors (49836552801).

78715237215 is a wasteful number, since it uses less digits than its factorization.

78715237215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178379.

The product of its digits is 823200, while the sum is 48.

The spelling of 78715237215 in words is "seventy-eight billion, seven hundred fifteen million, two hundred thirty-seven thousand, two hundred fifteen".