11001020028 has 12 divisors (see below), whose sum is σ = 25669046760. Its totient is φ = 3667006672.

The previous prime is 11001020027. The next prime is 11001020039. The reversal of 11001020028 is 82002010011.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 11001019989 and 11001020016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11001020021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 458375823 + ... + 458375846.

It is an arithmetic number, because the mean of its divisors is an integer number (2139087230).

Almost surely, 2^11001020028 is an apocalyptic number.

It is an amenable number.

11001020028 is an abundant number, since it is smaller than the sum of its proper divisors (14668026732).

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

11001020028 is a wasteful number, since it uses less digits than its factorization.

11001020028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 916751676 (or 916751674 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 11001020028 its reverse (82002010011), we get a palindrome (93003030039).

The spelling of 11001020028 in words is "eleven billion, one million, twenty thousand, twenty-eight".