628666307 has 4 divisors (see below), whose sum is σ = 665646696. Its totient is φ = 591685920.

The previous prime is 628666301. The next prime is 628666309. The reversal of 628666307 is 703666826.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 628666307 - 2¹⁸ = 628404163 is a prime.

It is not an unprimeable number, because it can be changed into a prime (628666301) 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 3 ways as a sum of consecutive naturals, for example, 18490169 + ... + 18490202.

It is an arithmetic number, because the mean of its divisors is an integer number (166411674).

Almost surely, 2^628666307 is an apocalyptic number.

628666307 is a deficient number, since it is larger than the sum of its proper divisors (36980389).

628666307 is a wasteful number, since it uses less digits than its factorization.

628666307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36980388.

The product of its (nonzero) digits is 435456, while the sum is 44.

The square root of 628666307 is about 25073.2189197957. The cubic root of 628666307 is about 856.6565274244.

The spelling of 628666307 in words is "six hundred twenty-eight million, six hundred sixty-six thousand, three hundred seven".