628943985 has 48 divisors (see below), whose sum is σ = 1215077760. Its totient is φ = 299082240.

The previous prime is 628943981. The next prime is 628944047. The reversal of 628943985 is 589349826.

628943985 is a `hidden beast` number, since 628 + 9 + 4 + 3 + 9 + 8 + 5 = 666.

It is not a de Polignac number, because 628943985 - 2² = 628943981 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (628943981) 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 in 47 ways as a sum of consecutive naturals, for example, 7101 + ... + 36170.

It is an arithmetic number, because the mean of its divisors is an integer number (25314120).

Almost surely, 2^628943985 is an apocalyptic number.

It is an amenable number.

628943985 is a deficient number, since it is larger than the sum of its proper divisors (586133775).

628943985 is a wasteful number, since it uses less digits than its factorization.

628943985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43318 (or 43315 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 54.

The square root of 628943985 is about 25078.7556509489. The cubic root of 628943985 is about 856.7826354802.

The spelling of 628943985 in words is "six hundred twenty-eight million, nine hundred forty-three thousand, nine hundred eighty-five".