551864880 has 640 divisors, whose sum is σ = 2442700800. Its totient is φ = 111476736.

The previous prime is 551864869. The next prime is 551864917. The reversal of 551864880 is 88468155.

It is a Harshad number since it is a multiple of its sum of digits (45).

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 127 ways as a sum of consecutive naturals, for example, 4883704 + ... + 4883816.

It is an arithmetic number, because the mean of its divisors is an integer number (3816720).

Almost surely, 2^551864880 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 551864880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1221350400).

551864880 is an abundant number, since it is smaller than the sum of its proper divisors (1890835920).

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

551864880 is a wasteful number, since it uses less digits than its factorization.

551864880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178 (or 166 counting only the distinct ones).

The product of its (nonzero) digits is 307200, while the sum is 45.

The square root of 551864880 is about 23491.8045283882. The cubic root of 551864880 is about 820.2462476779.

The spelling of 551864880 in words is "five hundred fifty-one million, eight hundred sixty-four thousand, eight hundred eighty".