50721085440 has 240 divisors, whose sum is σ = 181803061440. Its totient is φ = 13525401600.

The previous prime is 50721085433. The next prime is 50721085453. The reversal of 50721085440 is 4458012705.

50721085440 is a `hidden beast` number, since 5 + 0 + 7 + 2 + 108 + 544 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 50721085395 and 50721085404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 798865 + ... + 860015.

It is an arithmetic number, because the mean of its divisors is an integer number (757512756).

Almost surely, 2^50721085440 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 50721085440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90901530720).

50721085440 is an abundant number, since it is smaller than the sum of its proper divisors (131081976000).

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

50721085440 is an equidigital number, since it uses as much as digits as its factorization.

50721085440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61190 (or 61161 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 36.

The spelling of 50721085440 in words is "fifty billion, seven hundred twenty-one million, eighty-five thousand, four hundred forty".