551805228 has 72 divisors (see below), whose sum is σ = 1507335648. Its totient is φ = 169198848.

The previous prime is 551805217. The next prime is 551805253. The reversal of 551805228 is 822508155.

551805228 is a `hidden beast` number, since 5 + 51 + 80 + 522 + 8 = 666.

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 = 551805192 and 551805201.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 144601 + ... + 148367.

Almost surely, 2^551805228 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 551805228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (753667824).

551805228 is an abundant number, since it is smaller than the sum of its proper divisors (955530420).

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

551805228 is a wasteful number, since it uses less digits than its factorization.

551805228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4103 (or 4098 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 36.

The square root of 551805228 is about 23490.5348598111. The cubic root of 551805228 is about 820.2166926823.

The spelling of 551805228 in words is "five hundred fifty-one million, eight hundred five thousand, two hundred twenty-eight".