581223216 has 160 divisors (see below), whose sum is σ = 1815883776. Its totient is φ = 156672000.

The previous prime is 581223199. The next prime is 581223259. The reversal of 581223216 is 612322185.

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 31 ways as a sum of consecutive naturals, for example, 426376 + ... + 427736.

Almost surely, 2^581223216 is an apocalyptic number.

581223216 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 581223216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (907941888).

581223216 is an abundant number, since it is smaller than the sum of its proper divisors (1234660560).

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

581223216 is a wasteful number, since it uses less digits than its factorization.

581223216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1451 (or 1445 counting only the distinct ones).

The product of its digits is 5760, while the sum is 30.

The square root of 581223216 is about 24108.5714217993. The cubic root of 581223216 is about 834.5409483893.

The spelling of 581223216 in words is "five hundred eighty-one million, two hundred twenty-three thousand, two hundred sixteen".