628828813 has 2 divisors, whose sum is σ = 628828814. Its totient is φ = 628828812.

The previous prime is 628828799. The next prime is 628828819. The reversal of 628828813 is 318828826.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 571114404 + 57714409 = 23898^2 + 7597^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-628828813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (628828819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314414406 + 314414407.

It is an arithmetic number, because the mean of its divisors is an integer number (314414407).

Almost surely, 2^628828813 is an apocalyptic number.

It is an amenable number.

628828813 is a deficient number, since it is larger than the sum of its proper divisors (1).

628828813 is an equidigital number, since it uses as much as digits as its factorization.

628828813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 294912, while the sum is 46.

The square root of 628828813 is about 25076.4593393884. The cubic root of 628828813 is about 856.7303343766.

The spelling of 628828813 in words is "six hundred twenty-eight million, eight hundred twenty-eight thousand, eight hundred thirteen".