628022729 has 2 divisors, whose sum is σ = 628022730. Its totient is φ = 628022728.

The previous prime is 628022693. The next prime is 628022743. The reversal of 628022729 is 927220826.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 378224704 + 249798025 = 19448^2 + 15805^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-628022729 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 628022692 and 628022701.

It is not a weakly prime, because it can be changed into another prime (628022749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314011364 + 314011365.

It is an arithmetic number, because the mean of its divisors is an integer number (314011365).

Almost surely, 2^628022729 is an apocalyptic number.

It is an amenable number.

628022729 is a deficient number, since it is larger than the sum of its proper divisors (1).

628022729 is an equidigital number, since it uses as much as digits as its factorization.

628022729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 628022729 is about 25060.3816611001. The cubic root of 628022729 is about 856.3641022646.

The spelling of 628022729 in words is "six hundred twenty-eight million, twenty-two thousand, seven hundred twenty-nine".