551990880 has 216 divisors, whose sum is σ = 2191486752. Its totient is φ = 126153216.

The previous prime is 551990821. The next prime is 551990893. The reversal of 551990880 is 88099155.

551990880 is a `hidden beast` number, since 551 + 9 + 90 + 8 + 8 + 0 = 666.

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 (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 66649 + ... + 74471.

It is an arithmetic number, because the mean of its divisors is an integer number (10145772).

Almost surely, 2^551990880 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 551990880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1095743376).

551990880 is an abundant number, since it is smaller than the sum of its proper divisors (1639495872).

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

551990880 is a wasteful number, since it uses less digits than its factorization.

551990880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7858 (or 7840 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 45.

The square root of 551990880 is about 23494.4861616508. The cubic root of 551990880 is about 820.3086682488.

The spelling of 551990880 in words is "five hundred fifty-one million, nine hundred ninety thousand, eight hundred eighty".