551708820 has 480 divisors, whose sum is σ = 2090043648. Its totient is φ = 120434688.

The previous prime is 551708809. The next prime is 551708821. The reversal of 551708820 is 28807155.

551708820 is a `hidden beast` number, since 551 + 7 + 0 + 88 + 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 not an unprimeable number, because it can be changed into a prime (551708821) by changing a digit.

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 159 ways as a sum of consecutive naturals, for example, 8234427 + ... + 8234493.

Almost surely, 2^551708820 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 551708820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1045021824).

551708820 is an abundant number, since it is smaller than the sum of its proper divisors (1538334828).

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

551708820 is a wasteful number, since it uses less digits than its factorization.

551708820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141 (or 130 counting only the distinct ones).

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

The square root of 551708820 is about 23488.4827096175. The cubic root of 551708820 is about 820.1689221693.

The spelling of 551708820 in words is "five hundred fifty-one million, seven hundred eight thousand, eight hundred twenty".