1128729723 has 32 divisors (see below), whose sum is σ = 1680806400. Its totient is φ = 668010240.

The previous prime is 1128729703. The next prime is 1128729737. The reversal of 1128729723 is 3279278211.

It is not a de Polignac number, because 1128729723 - 2⁹ = 1128729211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1128729703) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 245853 + ... + 250401.

It is an arithmetic number, because the mean of its divisors is an integer number (52525200).

Almost surely, 2^1128729723 is an apocalyptic number.

1128729723 is a deficient number, since it is larger than the sum of its proper divisors (552076677).

1128729723 is a wasteful number, since it uses less digits than its factorization.

1128729723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4739.

The product of its digits is 84672, while the sum is 42.

The square root of 1128729723 is about 33596.5730841704. The cubic root of 1128729723 is about 1041.1899972581.

The spelling of 1128729723 in words is "one billion, one hundred twenty-eight million, seven hundred twenty-nine thousand, seven hundred twenty-three".