628138828 has 24 divisors (see below), whose sum is σ = 1122161040. Its totient is φ = 307544640.

The previous prime is 628138787. The next prime is 628138837. The reversal of 628138828 is 828831826.

It is a happy number.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118458 + ... + 123646.

It is an arithmetic number, because the mean of its divisors is an integer number (46756710).

Almost surely, 2^628138828 is an apocalyptic number.

It is an amenable number.

628138828 is a deficient number, since it is larger than the sum of its proper divisors (494022212).

628138828 is a wasteful number, since it uses less digits than its factorization.

628138828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5817 (or 5815 counting only the distinct ones).

The product of its digits is 294912, while the sum is 46.

The square root of 628138828 is about 25062.6979393680. The cubic root of 628138828 is about 856.4168694047.

The spelling of 628138828 in words is "six hundred twenty-eight million, one hundred thirty-eight thousand, eight hundred twenty-eight".