78218886044387 has 12 divisors (see below), whose sum is σ = 85977927640080. Its totient is φ = 71106592230960.

The previous prime is 78218886044309. The next prime is 78218886044417. The reversal of 78218886044387 is 78344068881287.

It is not a de Polignac number, because 78218886044387 - 2³⁰ = 78217812302563 is a prime.

It is a super-2 number, since 2×78218886044387² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78218886044287) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 919712 + ... + 12541277.

It is an arithmetic number, because the mean of its divisors is an integer number (7164827303340).

Almost surely, 2^{78218886044387} is an apocalyptic number.

78218886044387 is a deficient number, since it is larger than the sum of its proper divisors (7759041595693).

78218886044387 is a wasteful number, since it uses less digits than its factorization.

78218886044387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13509034 (or 13509023 counting only the distinct ones).

The product of its (nonzero) digits is 924844032, while the sum is 74.

The spelling of 78218886044387 in words is "seventy-eight trillion, two hundred eighteen billion, eight hundred eighty-six million, forty-four thousand, three hundred eighty-seven".