628442040389 has 2 divisors, whose sum is σ = 628442040390. Its totient is φ = 628442040388.

The previous prime is 628442040383. The next prime is 628442040431. The reversal of 628442040389 is 983040244826.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 502872448225 + 125569592164 = 709135^2 + 354358^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-628442040389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (628442040383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314221020194 + 314221020195.

It is an arithmetic number, because the mean of its divisors is an integer number (314221020195).

Almost surely, 2^628442040389 is an apocalyptic number.

It is an amenable number.

628442040389 is a deficient number, since it is larger than the sum of its proper divisors (1).

628442040389 is an equidigital number, since it uses as much as digits as its factorization.

628442040389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2654208, while the sum is 50.

The spelling of 628442040389 in words is "six hundred twenty-eight billion, four hundred forty-two million, forty thousand, three hundred eighty-nine".