550816728 has 256 divisors, whose sum is σ = 1847577600. Its totient is φ = 132464640.

The previous prime is 550816723. The next prime is 550816729. The reversal of 550816728 is 827618055.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 550816728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (550816723) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2795926 + ... + 2796122.

It is an arithmetic number, because the mean of its divisors is an integer number (7217100).

Almost surely, 2^550816728 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 550816728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (923788800).

550816728 is an abundant number, since it is smaller than the sum of its proper divisors (1296760872).

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

550816728 is a wasteful number, since it uses less digits than its factorization.

550816728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330 (or 326 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 42.

The square root of 550816728 is about 23469.4850390885. The cubic root of 550816728 is about 819.7266231274.

The spelling of 550816728 in words is "five hundred fifty million, eight hundred sixteen thousand, seven hundred twenty-eight".