628394237 has 2 divisors, whose sum is σ = 628394238. Its totient is φ = 628394236.

The previous prime is 628394231. The next prime is 628394267. The reversal of 628394237 is 732493826.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 412333636 + 216060601 = 20306^2 + 14699^2 .

It is a cyclic number.

It is not a de Polignac number, because 628394237 - 2⁸ = 628393981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (628394231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314197118 + 314197119.

It is an arithmetic number, because the mean of its divisors is an integer number (314197119).

Almost surely, 2^628394237 is an apocalyptic number.

It is an amenable number.

628394237 is a deficient number, since it is larger than the sum of its proper divisors (1).

628394237 is an equidigital number, since it uses as much as digits as its factorization.

628394237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 44.

The square root of 628394237 is about 25067.7928226639. The cubic root of 628394237 is about 856.5329302318.

It can be divided in two parts, 62839 and 4237, that added together give a palindrome (67076).

The spelling of 628394237 in words is "six hundred twenty-eight million, three hundred ninety-four thousand, two hundred thirty-seven".