50728457988 has 144 divisors (see below), whose sum is σ = 144990780480. Its totient is φ = 14845324032.

The previous prime is 50728457987. The next prime is 50728457993. The reversal of 50728457988 is 88975482705.

50728457988 is a `hidden beast` number, since 50 + 7 + 2 + 8 + 4 + 579 + 8 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (50728457987) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 881431 + ... + 937217.

It is an arithmetic number, because the mean of its divisors is an integer number (1006880420).

Almost surely, 2^50728457988 is an apocalyptic number.

50728457988 is a gapful number since it is divisible by the number (58) 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 50728457988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72495390240).

50728457988 is an abundant number, since it is smaller than the sum of its proper divisors (94262322492).

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

50728457988 is a wasteful number, since it uses less digits than its factorization.

50728457988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55906 (or 55901 counting only the distinct ones).

The product of its (nonzero) digits is 45158400, while the sum is 63.

The spelling of 50728457988 in words is "fifty billion, seven hundred twenty-eight million, four hundred fifty-seven thousand, nine hundred eighty-eight".