628885717 has 2 divisors, whose sum is σ = 628885718. Its totient is φ = 628885716.

The previous prime is 628885703. The next prime is 628885723. The reversal of 628885717 is 717588826.

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., 490799716 + 138086001 = 22154^2 + 11751^2 .

It is a cyclic number.

It is not a de Polignac number, because 628885717 - 2⁷ = 628885589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (628885727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314442858 + 314442859.

It is an arithmetic number, because the mean of its divisors is an integer number (314442859).

Almost surely, 2^628885717 is an apocalyptic number.

It is an amenable number.

628885717 is a deficient number, since it is larger than the sum of its proper divisors (1).

628885717 is an equidigital number, since it uses as much as digits as its factorization.

628885717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1505280, while the sum is 52.

The square root of 628885717 is about 25077.5939236602. The cubic root of 628885717 is about 856.7561760214.

The spelling of 628885717 in words is "six hundred twenty-eight million, eight hundred eighty-five thousand, seven hundred seventeen".