551778 has 16 divisors (see below), whose sum is σ = 1130976. Its totient is φ = 179360.

The previous prime is 551773. The next prime is 551801. The reversal of 551778 is 877155.

It is a super-2 number, since 2×551778² = 608917922568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (551773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 876 + ... + 1367.

It is an arithmetic number, because the mean of its divisors is an integer number (70686).

2⁵⁵¹⁷⁷⁸ is an apocalyptic number.

551778 is an abundant number, since it is smaller than the sum of its proper divisors (579198).

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

551778 is a wasteful number, since it uses less digits than its factorization.

551778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2289.

The product of its digits is 9800, while the sum is 33.

The square root of 551778 is about 742.8176088381. The cubic root of 551778 is about 82.0203201674.

The spelling of 551778 in words is "five hundred fifty-one thousand, seven hundred seventy-eight".