628464251 has 2 divisors, whose sum is σ = 628464252. Its totient is φ = 628464250.

The previous prime is 628464217. The next prime is 628464329. The reversal of 628464251 is 152464826.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-628464251 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (628464451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314232125 + 314232126.

It is an arithmetic number, because the mean of its divisors is an integer number (314232126).

Almost surely, 2^628464251 is an apocalyptic number.

628464251 is a deficient number, since it is larger than the sum of its proper divisors (1).

628464251 is an equidigital number, since it uses as much as digits as its factorization.

628464251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 92160, while the sum is 38.

The square root of 628464251 is about 25069.1892768793. The cubic root of 628464251 is about 856.5647399175.

The spelling of 628464251 in words is "six hundred twenty-eight million, four hundred sixty-four thousand, two hundred fifty-one".