1028403636 has 96 divisors (see below), whose sum is σ = 2667412608. Its totient is φ = 306408960.

The previous prime is 1028403619. The next prime is 1028403637. The reversal of 1028403636 is 6363048201.

1028403636 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×1028403636² = 2115228077076040992, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1028403597 and 1028403606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1028403637) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 636766 + ... + 638378.

It is an arithmetic number, because the mean of its divisors is an integer number (27785548).

Almost surely, 2^1028403636 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 1028403636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1333706304).

1028403636 is an abundant number, since it is smaller than the sum of its proper divisors (1639008972).

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

1028403636 is a wasteful number, since it uses less digits than its factorization.

1028403636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1761 (or 1759 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 1028403636 is about 32068.7329964874. The cubic root of 1028403636 is about 1009.3796262138.

The spelling of 1028403636 in words is "one billion, twenty-eight million, four hundred three thousand, six hundred thirty-six".