1126729728 has 72 divisors (see below), whose sum is σ = 3254255550. Its totient is φ = 375570432.

The previous prime is 1126729711. The next prime is 1126729739. The reversal of 1126729728 is 8279276211.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1109689344 + 17040384 = 33312^2 + 4128^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12133 + ... + 48996.

Almost surely, 2^1126729728 is an apocalyptic number.

1126729728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1126729728 is an abundant number, since it is smaller than the sum of its proper divisors (2127525822).

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

1126729728 is an equidigital number, since it uses as much as digits as its factorization.

1126729728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61157 (or 61134 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 1126729728 is about 33566.7950212706. The cubic root of 1126729728 is about 1040.5746725329.

The spelling of 1126729728 in words is "one billion, one hundred twenty-six million, seven hundred twenty-nine thousand, seven hundred twenty-eight".