628943618 has 8 divisors (see below), whose sum is σ = 956339148. Its totient is φ = 310163904.

The previous prime is 628943617. The next prime is 628943639. The reversal of 628943618 is 816349826.

628943618 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 560600329 + 68343289 = 23677^2 + 8267^2 .

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

It is not an unprimeable number, because it can be changed into a prime (628943617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2153771 + ... + 2154062.

Almost surely, 2^628943618 is an apocalyptic number.

628943618 is a deficient number, since it is larger than the sum of its proper divisors (327395530).

628943618 is a wasteful number, since it uses less digits than its factorization.

628943618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4307908.

The product of its digits is 497664, while the sum is 47.

The square root of 628943618 is about 25078.7483339979. The cubic root of 628943618 is about 856.7824688309.

The spelling of 628943618 in words is "six hundred twenty-eight million, nine hundred forty-three thousand, six hundred eighteen".