78438281026520 has 64 divisors (see below), whose sum is σ = 181639801728000. Its totient is φ = 30471918613888.

The previous prime is 78438281026493. The next prime is 78438281026543. The reversal of 78438281026520 is 2562018283487.

78438281026520 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 200024360 + ... + 200416119.

It is an arithmetic number, because the mean of its divisors is an integer number (2838121902000).

Almost surely, 2^{78438281026520} is an apocalyptic number.

It is an amenable number.

78438281026520 is an abundant number, since it is smaller than the sum of its proper divisors (103201520701480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78438281026520 is a wasteful number, since it uses less digits than its factorization.

78438281026520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400440632 (or 400440628 counting only the distinct ones).

The product of its (nonzero) digits is 10321920, while the sum is 56.

The spelling of 78438281026520 in words is "seventy-eight trillion, four hundred thirty-eight billion, two hundred eighty-one million, twenty-six thousand, five hundred twenty".