47478291728778 has 80 divisors (see below), whose sum is σ = 107350635268800. Its totient is φ = 15682737538944.

The previous prime is 47478291728773. The next prime is 47478291728779. The reversal of 47478291728778 is 87782719287474.

47478291728778 is a `hidden beast` number, since 4 + 7 + 47 + 8 + 291 + 7 + 287 + 7 + 8 = 666.

47478291728778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a junction number, because it is equal to n+sod(n) for n = 47478291728697 and 47478291728706.

It is not an unprimeable number, because it can be changed into a prime (47478291728773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 87359923 + ... + 87901721.

It is an arithmetic number, because the mean of its divisors is an integer number (1341882940860).

Almost surely, 2^{47478291728778} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 47478291728778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53675317634400).

47478291728778 is an abundant number, since it is smaller than the sum of its proper divisors (59872343540022).

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

47478291728778 is a wasteful number, since it uses less digits than its factorization.

47478291728778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546713 (or 546704 counting only the distinct ones).

The product of its digits is 4956585984, while the sum is 81.

The spelling of 47478291728778 in words is "forty-seven trillion, four hundred seventy-eight billion, two hundred ninety-one million, seven hundred twenty-eight thousand, seven hundred seventy-eight".