628744379 has 2 divisors, whose sum is σ = 628744380. Its totient is φ = 628744378.

The previous prime is 628744357. The next prime is 628744393. The reversal of 628744379 is 973447826.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-628744379 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (628744309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314372189 + 314372190.

It is an arithmetic number, because the mean of its divisors is an integer number (314372190).

Almost surely, 2^628744379 is an apocalyptic number.

628744379 is a deficient number, since it is larger than the sum of its proper divisors (1).

628744379 is an equidigital number, since it uses as much as digits as its factorization.

628744379 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2032128, while the sum is 50.

The square root of 628744379 is about 25074.7757517390. The cubic root of 628744379 is about 856.6919877416.

The spelling of 628744379 in words is "six hundred twenty-eight million, seven hundred forty-four thousand, three hundred seventy-nine".