628178281 has 2 divisors, whose sum is σ = 628178282. Its totient is φ = 628178280.

The previous prime is 628178269. The next prime is 628178293. The reversal of 628178281 is 182871826.

It is a balanced prime because it is at equal distance from previous prime (628178269) and next prime (628178293).

It can be written as a sum of positive squares in only one way, i.e., 620807056 + 7371225 = 24916^2 + 2715^2 .

It is a cyclic number.

It is not a de Polignac number, because 628178281 - 2⁵ = 628178249 is a prime.

It is a super-2 number, since 2×628178281² = 789215905440229922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (628178381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314089140 + 314089141.

It is an arithmetic number, because the mean of its divisors is an integer number (314089141).

Almost surely, 2^628178281 is an apocalyptic number.

It is an amenable number.

628178281 is a deficient number, since it is larger than the sum of its proper divisors (1).

628178281 is an equidigital number, since it uses as much as digits as its factorization.

628178281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86016, while the sum is 43.

The square root of 628178281 is about 25063.4850130623. The cubic root of 628178281 is about 856.4347993621.

The spelling of 628178281 in words is "six hundred twenty-eight million, one hundred seventy-eight thousand, two hundred eighty-one".