6478478838792 has 176 divisors, whose sum is σ = 18239085019500. Its totient is φ = 2157304669056.

The previous prime is 6478478838787. The next prime is 6478478838803. The reversal of 6478478838792 is 2978388748746.

It is a happy number.

6478478838792 is a `hidden beast` number, since 6 + 4 + 7 + 84 + 78 + 8 + 387 + 92 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6359747597316 + 118731241476 = 2521854^2 + 344574^2 .

It is a Harshad number since it is a multiple of its sum of digits (81).

It is an unprimeable number.

It is a polite number, since it can be written in 43 ways as a sum of consecutive naturals, for example, 504980634 + ... + 504993462.

Almost surely, 2^{6478478838792} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6478478838792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9119542509750).

6478478838792 is an abundant number, since it is smaller than the sum of its proper divisors (11760606180708).

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

6478478838792 is a wasteful number, since it uses less digits than its factorization.

6478478838792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13934 (or 13903 counting only the distinct ones).

The product of its digits is 7283146752, while the sum is 81.

The spelling of 6478478838792 in words is "six trillion, four hundred seventy-eight billion, four hundred seventy-eight million, eight hundred thirty-eight thousand, seven hundred ninety-two".