628426457 has 2 divisors, whose sum is σ = 628426458. Its totient is φ = 628426456.

The previous prime is 628426439. The next prime is 628426517. The reversal of 628426457 is 754624826.

628426457 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., 611869696 + 16556761 = 24736^2 + 4069^2 .

It is a cyclic number.

It is not a de Polignac number, because 628426457 - 2¹⁶ = 628360921 is a prime.

It is equal to p_32729597 and since 628426457 and 32729597 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (628426417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314213228 + 314213229.

It is an arithmetic number, because the mean of its divisors is an integer number (314213229).

Almost surely, 2^628426457 is an apocalyptic number.

It is an amenable number.

628426457 is a deficient number, since it is larger than the sum of its proper divisors (1).

628426457 is an equidigital number, since it uses as much as digits as its factorization.

628426457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 645120, while the sum is 44.

The square root of 628426457 is about 25068.4354717242. The cubic root of 628426457 is about 856.5475691415.

The spelling of 628426457 in words is "six hundred twenty-eight million, four hundred twenty-six thousand, four hundred fifty-seven".