1028909056 has 72 divisors (see below), whose sum is σ = 2393437410. Its totient is φ = 440918016.

The previous prime is 1028909051. The next prime is 1028909059. The reversal of 1028909056 is 6509098201.

It can be written as a sum of positive squares in only one way, i.e., 997549056 + 31360000 = 31584^2 + 5600^2 .

It is a super-2 number, since 2×1028909056² = 2117307691037622272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1028909051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 95226 + ... + 105478.

Almost surely, 2^1028909056 is an apocalyptic number.

1028909056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1028909056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1196718705).

1028909056 is an abundant number, since it is smaller than the sum of its proper divisors (1364528354).

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

1028909056 is an equidigital number, since it uses as much as digits as its factorization.

1028909056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10289 (or 10262 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 1028909056 is about 32076.6122899536. The cubic root of 1028909056 is about 1009.5449559478.

The spelling of 1028909056 in words is "one billion, twenty-eight million, nine hundred nine thousand, fifty-six".