1028978866 has 8 divisors (see below), whose sum is σ = 1568771244. Its totient is φ = 506055120.

The previous prime is 1028978851. The next prime is 1028978869. The reversal of 1028978866 is 6688798201.

It can be written as a sum of positive squares in 2 ways, for example, as 1002672225 + 26306641 = 31665^2 + 5129^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1028978869) 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 3 ways as a sum of consecutive naturals, for example, 4217005 + ... + 4217248.

Almost surely, 2^1028978866 is an apocalyptic number.

1028978866 is a deficient number, since it is larger than the sum of its proper divisors (539792378).

1028978866 is an equidigital number, since it uses as much as digits as its factorization.

1028978866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8434316.

The product of its (nonzero) digits is 2322432, while the sum is 55.

The square root of 1028978866 is about 32077.7004475071. The cubic root of 1028978866 is about 1009.5677874893.

The spelling of 1028978866 in words is "one billion, twenty-eight million, nine hundred seventy-eight thousand, eight hundred sixty-six".