1028478985 has 4 divisors (see below), whose sum is σ = 1234174788. Its totient is φ = 822783184.

The previous prime is 1028478967. The next prime is 1028478991. The reversal of 1028478985 is 5898748201.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 616429584 + 412049401 = 24828^2 + 20299^2 .

It is a cyclic number.

It is not a de Polignac number, because 1028478985 - 2⁵ = 1028478953 is a prime.

It is a Duffinian 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, 102847894 + ... + 102847903.

It is an arithmetic number, because the mean of its divisors is an integer number (308543697).

Almost surely, 2^1028478985 is an apocalyptic number.

It is an amenable number.

1028478985 is a deficient number, since it is larger than the sum of its proper divisors (205695803).

1028478985 is an equidigital number, since it uses as much as digits as its factorization.

1028478985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205695802.

The product of its (nonzero) digits is 1290240, while the sum is 52.

The square root of 1028478985 is about 32069.9077797240. The cubic root of 1028478985 is about 1009.4042773285.

The spelling of 1028478985 in words is "one billion, twenty-eight million, four hundred seventy-eight thousand, nine hundred eighty-five".