1122621728 has 18 divisors (see below), whose sum is σ = 2210534739. Its totient is φ = 561216096.

The previous prime is 1122621701. The next prime is 1122621737. The reversal of 1122621728 is 8271262211.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 561310864 + 561310864 = 23692^2 + 23692^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=23692.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1122621694 and 1122621703.

It is an unprimeable number.

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 2 ways as a sum of consecutive naturals, for example, 186575 + ... + 192497.

Almost surely, 2^1122621728 is an apocalyptic number.

It is an amenable number.

1122621728 is a deficient number, since it is larger than the sum of its proper divisors (1087913011).

1122621728 is an frugal number, since it uses more digits than its factorization.

1122621728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11856 (or 5925 counting only the distinct ones).

The product of its digits is 5376, while the sum is 32.

The square root of 1122621728 is about 33505.5477197434. The cubic root of 1122621728 is about 1039.3085048243.

Multiplying 1122621728 by its sum of digits (32), we get a square (35923895296 = 189536²).

1122621728 divided by its sum of digits (32) gives a square (35081929 = 5923²).

Adding to 1122621728 its reverse (8271262211), we get a palindrome (9393883939).

The spelling of 1122621728 in words is "one billion, one hundred twenty-two million, six hundred twenty-one thousand, seven hundred twenty-eight".