1111321728 has 512 divisors, whose sum is σ = 3948134400. Its totient is φ = 304128000.

The previous prime is 1111321727. The next prime is 1111321741. The reversal of 1111321728 is 8271231111.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1111321727) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 27105388 + ... + 27105428.

It is an arithmetic number, because the mean of its divisors is an integer number (7711200).

Almost surely, 2^1111321728 is an apocalyptic number.

1111321728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1111321728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1974067200).

1111321728 is an abundant number, since it is smaller than the sum of its proper divisors (2836812672).

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

1111321728 is a wasteful number, since it uses less digits than its factorization.

1111321728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129 (or 111 counting only the distinct ones).

The product of its digits is 672, while the sum is 27.

The square root of 1111321728 is about 33336.4924369676. The cubic root of 1111321728 is about 1035.8096080810.

Adding to 1111321728 its reverse (8271231111), we get a palindrome (9382552839).

The spelling of 1111321728 in words is "one billion, one hundred eleven million, three hundred twenty-one thousand, seven hundred twenty-eight".