551809856 has 112 divisors (see below), whose sum is σ = 1262237760. Its totient is φ = 237219840.

The previous prime is 551809829. The next prime is 551809861. The reversal of 551809856 is 658908155.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 551809856.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 1058876 + ... + 1059396.

It is an arithmetic number, because the mean of its divisors is an integer number (11269980).

Almost surely, 2^551809856 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 551809856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (631118880).

551809856 is an abundant number, since it is smaller than the sum of its proper divisors (710427904).

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

551809856 is a wasteful number, since it uses less digits than its factorization.

551809856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 632 (or 622 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 47.

The square root of 551809856 is about 23490.6333673658. The cubic root of 551809856 is about 820.2189857331.

The spelling of 551809856 in words is "five hundred fifty-one million, eight hundred nine thousand, eight hundred fifty-six".