628989983 has 2 divisors, whose sum is σ = 628989984. Its totient is φ = 628989982.

The previous prime is 628989937. The next prime is 628990027. The reversal of 628989983 is 389989826.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-628989983 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (628989083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314494991 + 314494992.

It is an arithmetic number, because the mean of its divisors is an integer number (314494992).

Almost surely, 2^628989983 is an apocalyptic number.

628989983 is a deficient number, since it is larger than the sum of its proper divisors (1).

628989983 is an equidigital number, since it uses as much as digits as its factorization.

628989983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13436928, while the sum is 62.

The square root of 628989983 is about 25079.6727052009. The cubic root of 628989983 is about 856.8035219862.

The spelling of 628989983 in words is "six hundred twenty-eight million, nine hundred eighty-nine thousand, nine hundred eighty-three".