550728 has 24 divisors (see below), whose sum is σ = 1491750. Its totient is φ = 183552.

The previous prime is 550721. The next prime is 550733. The reversal of 550728 is 827055.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 544644 + 6084 = 738^2 + 78^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (550721) by changing a digit.

550728 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3753 + ... + 3896.

2⁵⁵⁰⁷²⁸ is an apocalyptic number.

It is an amenable number.

550728 is an abundant number, since it is smaller than the sum of its proper divisors (941022).

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

550728 is a wasteful number, since it uses less digits than its factorization.

550728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7661 (or 7654 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 27.

The square root of 550728 is about 742.1105039009. The cubic root of 550728 is about 81.9682605698.

The spelling of 550728 in words is "five hundred fifty thousand, seven hundred twenty-eight".