628441357 has 4 divisors (see below), whose sum is σ = 632074140. Its totient is φ = 624808576.

The previous prime is 628441349. The next prime is 628441361. The reversal of 628441357 is 753144826.

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

It can be written as a sum of positive squares in 2 ways, for example, as 525601476 + 102839881 = 22926^2 + 10141^2 .

It is a cyclic number.

It is not a de Polignac number, because 628441357 - 2³ = 628441349 is a prime.

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 a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628441367) 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, 1816132 + ... + 1816477.

It is an arithmetic number, because the mean of its divisors is an integer number (158018535).

Almost surely, 2^628441357 is an apocalyptic number.

It is an amenable number.

628441357 is a deficient number, since it is larger than the sum of its proper divisors (3632783).

628441357 is a wasteful number, since it uses less digits than its factorization.

628441357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3632782.

The product of its digits is 161280, while the sum is 40.

The square root of 628441357 is about 25068.7326564388. The cubic root of 628441357 is about 856.5543386729.

The spelling of 628441357 in words is "six hundred twenty-eight million, four hundred forty-one thousand, three hundred fifty-seven".