628781641 has 2 divisors, whose sum is σ = 628781642. Its totient is φ = 628781640.

The previous prime is 628781633. The next prime is 628781719. The reversal of 628781641 is 146187826.

628781641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 409860025 + 218921616 = 20245^2 + 14796^2 .

It is a cyclic number.

It is not a de Polignac number, because 628781641 - 2³ = 628781633 is a prime.

It is not a weakly prime, because it can be changed into another prime (628787641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314390820 + 314390821.

It is an arithmetic number, because the mean of its divisors is an integer number (314390821).

Almost surely, 2^628781641 is an apocalyptic number.

It is an amenable number.

628781641 is a deficient number, since it is larger than the sum of its proper divisors (1).

628781641 is an equidigital number, since it uses as much as digits as its factorization.

628781641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129024, while the sum is 43.

The square root of 628781641 is about 25075.5187583428. The cubic root of 628781641 is about 856.7089111142.

The spelling of 628781641 in words is "six hundred twenty-eight million, seven hundred eighty-one thousand, six hundred forty-one".