50921728 has 108 divisors (see below), whose sum is σ = 121192848. Its totient is φ = 21166080.

The previous prime is 50921719. The next prime is 50921743. The reversal of 50921728 is 82712905.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 50921693 and 50921702.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 475851 + ... + 475957.

It is an arithmetic number, because the mean of its divisors is an integer number (1122156).

Almost surely, 2^50921728 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 50921728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60596424).

50921728 is an abundant number, since it is smaller than the sum of its proper divisors (70271120).

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

50921728 is a wasteful number, since it uses less digits than its factorization.

50921728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160 (or 133 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 50921728 is about 7135.9461881379. The cubic root of 50921728 is about 370.6531633080.

The spelling of 50921728 in words is "fifty million, nine hundred twenty-one thousand, seven hundred twenty-eight".