550817820 has 288 divisors, whose sum is σ = 2025898560. Its totient is φ = 125411328.

The previous prime is 550817801. The next prime is 550817837. The reversal of 550817820 is 28718055.

550817820 is a `hidden beast` number, since 550 + 81 + 7 + 8 + 20 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2143132 + ... + 2143388.

It is an arithmetic number, because the mean of its divisors is an integer number (7034370).

Almost surely, 2^550817820 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 550817820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1012949280).

550817820 is an abundant number, since it is smaller than the sum of its proper divisors (1475080740).

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

550817820 is a wasteful number, since it uses less digits than its factorization.

550817820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301 (or 274 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

The square root of 550817820 is about 23469.5083033284. The cubic root of 550817820 is about 819.7271648326.

The spelling of 550817820 in words is "five hundred fifty million, eight hundred seventeen thousand, eight hundred twenty".