628887428 has 12 divisors (see below), whose sum is σ = 1185211020. Its totient is φ = 290255712.

The previous prime is 628887379. The next prime is 628887437. The reversal of 628887428 is 824788826.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 76073284 + 552814144 = 8722^2 + 23512^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 628887428.

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, 6046943 + ... + 6047046.

It is an arithmetic number, because the mean of its divisors is an integer number (98767585).

Almost surely, 2^628887428 is an apocalyptic number.

It is an amenable number.

628887428 is a deficient number, since it is larger than the sum of its proper divisors (556323592).

628887428 is a wasteful number, since it uses less digits than its factorization.

628887428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12094006 (or 12094004 counting only the distinct ones).

The product of its digits is 2752512, while the sum is 53.

The square root of 628887428 is about 25077.6280377551. The cubic root of 628887428 is about 856.7569530086.

The spelling of 628887428 in words is "six hundred twenty-eight million, eight hundred eighty-seven thousand, four hundred twenty-eight".