628355481 has 8 divisors (see below), whose sum is σ = 902254080. Its totient is φ = 386680272.

The previous prime is 628355473. The next prime is 628355489. The reversal of 628355481 is 184553826.

It is an interprime number because it is at equal distance from previous prime (628355473) and next prime (628355489).

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

It is not a de Polignac number, because 628355481 - 2³ = 628355473 is a prime.

It is a super-2 number, since 2×628355481² = 789661221005482722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (628355489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8055801 + ... + 8055878.

It is an arithmetic number, because the mean of its divisors is an integer number (112781760).

Almost surely, 2^628355481 is an apocalyptic number.

It is an amenable number.

628355481 is a deficient number, since it is larger than the sum of its proper divisors (273898599).

628355481 is a wasteful number, since it uses less digits than its factorization.

628355481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16111695.

The product of its digits is 230400, while the sum is 42.

The square root of 628355481 is about 25067.0197869631. The cubic root of 628355481 is about 856.5153210778.

The spelling of 628355481 in words is "six hundred twenty-eight million, three hundred fifty-five thousand, four hundred eighty-one".