628511617 has 2 divisors, whose sum is σ = 628511618. Its totient is φ = 628511616.

The previous prime is 628511603. The next prime is 628511623. The reversal of 628511617 is 716115826.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 514790721 + 113720896 = 22689^2 + 10664^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-628511617 is a prime.

It is not a weakly prime, because it can be changed into another prime (628511717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314255808 + 314255809.

It is an arithmetic number, because the mean of its divisors is an integer number (314255809).

Almost surely, 2^628511617 is an apocalyptic number.

It is an amenable number.

628511617 is a deficient number, since it is larger than the sum of its proper divisors (1).

628511617 is an equidigital number, since it uses as much as digits as its factorization.

628511617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 37.

The square root of 628511617 is about 25070.1339645404. The cubic root of 628511617 is about 856.5862585248.

The spelling of 628511617 in words is "six hundred twenty-eight million, five hundred eleven thousand, six hundred seventeen".