628644842 has 8 divisors (see below), whose sum is σ = 1077676896. Its totient is φ = 269419212.

The previous prime is 628644839. The next prime is 628644889. The reversal of 628644842 is 248446826.

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

It is a junction number, because it is equal to n+sod(n) for n = 628644793 and 628644802.

It is an unprimeable number.

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, 22451588 + ... + 22451615.

It is an arithmetic number, because the mean of its divisors is an integer number (134709612).

Almost surely, 2^628644842 is an apocalyptic number.

628644842 is a deficient number, since it is larger than the sum of its proper divisors (449032054).

628644842 is a wasteful number, since it uses less digits than its factorization.

628644842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44903212.

The product of its digits is 589824, while the sum is 44.

The square root of 628644842 is about 25072.7908697855. The cubic root of 628644842 is about 856.6467775027.

The spelling of 628644842 in words is "six hundred twenty-eight million, six hundred forty-four thousand, eight hundred forty-two".