1001222028 has 36 divisors (see below), whose sum is σ = 2561366808. Its totient is φ = 329718720.

The previous prime is 1001222023. The next prime is 1001222041. The reversal of 1001222028 is 8202221001.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 1001222028.

It is not an unprimeable number, because it can be changed into a prime (1001222023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 164553 + ... + 170528.

It is an arithmetic number, because the mean of its divisors is an integer number (71149078).

Almost surely, 2^1001222028 is an apocalyptic number.

1001222028 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1001222028 is an abundant number, since it is smaller than the sum of its proper divisors (1560144780).

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

1001222028 is a wasteful number, since it uses less digits than its factorization.

1001222028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335174 (or 335169 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 1001222028 is about 31642.0926615166. The cubic root of 1001222028 is about 1000.4071768512.

Adding to 1001222028 its reverse (8202221001), we get a palindrome (9203443029).

The spelling of 1001222028 in words is "one billion, one million, two hundred twenty-two thousand, twenty-eight".