628143839 has 2 divisors, whose sum is σ = 628143840. Its totient is φ = 628143838.

The previous prime is 628143787. The next prime is 628143853. The reversal of 628143839 is 938341826.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-628143839 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 628143839.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (628143899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314071919 + 314071920.

It is an arithmetic number, because the mean of its divisors is an integer number (314071920).

Almost surely, 2^628143839 is an apocalyptic number.

628143839 is a deficient number, since it is larger than the sum of its proper divisors (1).

628143839 is an equidigital number, since it uses as much as digits as its factorization.

628143839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 44.

The square root of 628143839 is about 25062.7979084539. The cubic root of 628143839 is about 856.4191467640.

The spelling of 628143839 in words is "six hundred twenty-eight million, one hundred forty-three thousand, eight hundred thirty-nine".