47155717728 has 576 divisors, whose sum is σ = 166322257920. Its totient is φ = 12729249792.

The previous prime is 47155717717. The next prime is 47155717753. The reversal of 47155717728 is 82771755174.

47155717728 is a `hidden beast` number, since 4 + 7 + 1 + 557 + 17 + 72 + 8 = 666.

47155717728 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 (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 371304801 + ... + 371304927.

It is an arithmetic number, because the mean of its divisors is an integer number (288753920).

Almost surely, 2^47155717728 is an apocalyptic number.

47155717728 is a gapful number since it is divisible by the number (48) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 47155717728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83161128960).

47155717728 is an abundant number, since it is smaller than the sum of its proper divisors (119166540192).

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

47155717728 is a wasteful number, since it uses less digits than its factorization.

47155717728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284 (or 241 counting only the distinct ones).

The product of its digits is 3841600, while the sum is 54.

The spelling of 47155717728 in words is "forty-seven billion, one hundred fifty-five million, seven hundred seventeen thousand, seven hundred twenty-eight".