551806320 has 320 divisors, whose sum is σ = 1943875584. Its totient is φ = 128593920.

The previous prime is 551806313. The next prime is 551806337. The reversal of 551806320 is 23608155.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7771885 + ... + 7771955.

Almost surely, 2^551806320 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 551806320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (971937792).

551806320 is an abundant number, since it is smaller than the sum of its proper divisors (1392069264).

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

551806320 is a wasteful number, since it uses less digits than its factorization.

551806320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200 (or 194 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 551806320 is about 23490.5581032039. The cubic root of 551806320 is about 820.2172337404.

The spelling of 551806320 in words is "five hundred fifty-one million, eight hundred six thousand, three hundred twenty".