628644266 has 8 divisors (see below), whose sum is σ = 947121120. Its totient is φ = 312937228.

The previous prime is 628644239. The next prime is 628644283. The reversal of 628644266 is 662446826.

628644266 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×628644266² = 790387226349357512, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 691886 + ... + 692793.

It is an arithmetic number, because the mean of its divisors is an integer number (118390140).

Almost surely, 2^628644266 is an apocalyptic number.

628644266 is a deficient number, since it is larger than the sum of its proper divisors (318476854).

628644266 is a wasteful number, since it uses less digits than its factorization.

628644266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1384908.

The product of its digits is 663552, while the sum is 44.

The square root of 628644266 is about 25072.7793832275. The cubic root of 628644266 is about 856.6465158666.

The spelling of 628644266 in words is "six hundred twenty-eight million, six hundred forty-four thousand, two hundred sixty-six".