1028685228 has 24 divisors (see below), whose sum is σ = 2430650880. Its totient is φ = 338554320.

The previous prime is 1028685223. The next prime is 1028685239. The reversal of 1028685228 is 8225868201.

It is a self number, because there is not a number n which added to its sum of digits gives 1028685228.

It is not an unprimeable number, because it can be changed into a prime (1028685221) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 541608 + ... + 543503.

It is an arithmetic number, because the mean of its divisors is an integer number (101277120).

Almost surely, 2^1028685228 is an apocalyptic number.

It is an amenable number.

1028685228 is an abundant number, since it is smaller than the sum of its proper divisors (1401965652).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1028685228 is a wasteful number, since it uses less digits than its factorization.

1028685228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1085197 (or 1085195 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 42.

The square root of 1028685228 is about 32073.1231407233. The cubic root of 1028685228 is about 1009.4717454554.

The spelling of 1028685228 in words is "one billion, twenty-eight million, six hundred eighty-five thousand, two hundred twenty-eight".