1028111656 has 64 divisors (see below), whose sum is σ = 2270520000. Its totient is φ = 430272000.

The previous prime is 1028111627. The next prime is 1028111657. The reversal of 1028111656 is 6561118201.

It is not an unprimeable number, because it can be changed into a prime (1028111657) 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 15 ways as a sum of consecutive naturals, for example, 569956 + ... + 571756.

It is an arithmetic number, because the mean of its divisors is an integer number (35476875).

Almost surely, 2^1028111656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1028111656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1135260000).

1028111656 is an abundant number, since it is smaller than the sum of its proper divisors (1242408344).

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

1028111656 is a wasteful number, since it uses less digits than its factorization.

1028111656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2330 (or 2326 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 31.

The square root of 1028111656 is about 32064.1802639643. The cubic root of 1028111656 is about 1009.2840909106.

Adding to 1028111656 its reverse (6561118201), we get a palindrome (7589229857).

The spelling of 1028111656 in words is "one billion, twenty-eight million, one hundred eleven thousand, six hundred fifty-six".