628181322 has 8 divisors (see below), whose sum is σ = 1256362656. Its totient is φ = 209393772.

The previous prime is 628181321. The next prime is 628181327. The reversal of 628181322 is 223181826.

It is a sphenic number, since it is the product of 3 distinct primes.

628181322 is an admirable number.

It is a super-2 number, since 2×628181322² = 789223546619335368, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (628181321) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 52348438 + ... + 52348449.

It is an arithmetic number, because the mean of its divisors is an integer number (157045332).

Almost surely, 2^628181322 is an apocalyptic number.

628181322 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

628181322 is a wasteful number, since it uses less digits than its factorization.

628181322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104696892.

The product of its digits is 9216, while the sum is 33.

The square root of 628181322 is about 25063.5456789338. The cubic root of 628181322 is about 856.4361813551.

The spelling of 628181322 in words is "six hundred twenty-eight million, one hundred eighty-one thousand, three hundred twenty-two".