628443481 has 4 divisors (see below), whose sum is σ = 629209764. Its totient is φ = 627677200.

The previous prime is 628443469. The next prime is 628443493. The reversal of 628443481 is 184344826.

It is a happy number.

628443481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (628443469) and next prime (628443493).

It can be written as a sum of positive squares in 2 ways, for example, as 187443481 + 441000000 = 13691^2 + 21000^2 .

It is a cyclic number.

It is not a de Polignac number, because 628443481 - 2⁷ = 628443353 is a prime.

It is a super-2 number, since 2×628443481² = 789882417622794722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (628443401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 381910 + ... + 383551.

It is an arithmetic number, because the mean of its divisors is an integer number (157302441).

Almost surely, 2^628443481 is an apocalyptic number.

It is an amenable number.

628443481 is a deficient number, since it is larger than the sum of its proper divisors (766283).

628443481 is an equidigital number, since it uses as much as digits as its factorization.

628443481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766282.

The product of its digits is 147456, while the sum is 40.

The square root of 628443481 is about 25068.7750199327. The cubic root of 628443481 is about 856.5553036631. Note that the first 3 decimals are identical.

The spelling of 628443481 in words is "six hundred twenty-eight million, four hundred forty-three thousand, four hundred eighty-one".