628215556 has 12 divisors (see below), whose sum is σ = 1110262860. Its totient is φ = 310997600.

The previous prime is 628215547. The next prime is 628215559. The reversal of 628215556 is 655512826.

It can be written as a sum of positive squares in 2 ways, for example, as 379080900 + 249134656 = 19470^2 + 15784^2 .

It is not an unprimeable number, because it can be changed into a prime (628215559) 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, 777091 + ... + 777898.

It is an arithmetic number, because the mean of its divisors is an integer number (92521905).

Almost surely, 2^628215556 is an apocalyptic number.

It is an amenable number.

628215556 is a deficient number, since it is larger than the sum of its proper divisors (482047304).

628215556 is a wasteful number, since it uses less digits than its factorization.

628215556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1555094 (or 1555092 counting only the distinct ones).

The product of its digits is 144000, while the sum is 40.

The square root of 628215556 is about 25064.2286137036. The cubic root of 628215556 is about 856.4517388078.

The spelling of 628215556 in words is "six hundred twenty-eight million, two hundred fifteen thousand, five hundred fifty-six".