628320665 has 16 divisors (see below), whose sum is σ = 866080512. Its totient is φ = 428656704.

The previous prime is 628320659. The next prime is 628320683. The reversal of 628320665 is 566023826.

628320665 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 628320665 - 2¹⁸ = 628058521 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38669 + ... + 52458.

It is an arithmetic number, because the mean of its divisors is an integer number (54130032).

Almost surely, 2^628320665 is an apocalyptic number.

It is an amenable number.

628320665 is a deficient number, since it is larger than the sum of its proper divisors (237759847).

628320665 is a wasteful number, since it uses less digits than its factorization.

628320665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91336.

The product of its (nonzero) digits is 103680, while the sum is 38.

The square root of 628320665 is about 25066.3253190411. The cubic root of 628320665 is about 856.4995014825.

The spelling of 628320665 in words is "six hundred twenty-eight million, three hundred twenty thousand, six hundred sixty-five".