628887361 has 2 divisors, whose sum is σ = 628887362. Its totient is φ = 628887360.

The previous prime is 628887349. The next prime is 628887379. The reversal of 628887361 is 163788826.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 556960000 + 71927361 = 23600^2 + 8481^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-628887361 is a prime.

It is not a weakly prime, because it can be changed into another prime (628887461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314443680 + 314443681.

It is an arithmetic number, because the mean of its divisors is an integer number (314443681).

Almost surely, 2^628887361 is an apocalyptic number.

It is an amenable number.

628887361 is a deficient number, since it is larger than the sum of its proper divisors (1).

628887361 is an equidigital number, since it uses as much as digits as its factorization.

628887361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 774144, while the sum is 49.

The square root of 628887361 is about 25077.6267019030. The cubic root of 628887361 is about 856.7569225831.

The spelling of 628887361 in words is "six hundred twenty-eight million, eight hundred eighty-seven thousand, three hundred sixty-one".