628418228 has 12 divisors (see below), whose sum is σ = 1107113700. Its totient is φ = 312100032.

The previous prime is 628418173. The next prime is 628418233. The reversal of 628418228 is 822814826.

It can be written as a sum of positive squares in 2 ways, for example, as 320696464 + 307721764 = 17908^2 + 17542^2 .

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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, 526601 + ... + 527792.

It is an arithmetic number, because the mean of its divisors is an integer number (92259475).

Almost surely, 2^628418228 is an apocalyptic number.

It is an amenable number.

628418228 is a deficient number, since it is larger than the sum of its proper divisors (478695472).

628418228 is a wasteful number, since it uses less digits than its factorization.

628418228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1054546 (or 1054544 counting only the distinct ones).

The product of its digits is 98304, while the sum is 41.

The square root of 628418228 is about 25068.2713404814. The cubic root of 628418228 is about 856.5438304061.

The spelling of 628418228 in words is "six hundred twenty-eight million, four hundred eighteen thousand, two hundred twenty-eight".