1158728556 has 48 divisors (see below), whose sum is σ = 2787611904. Its totient is φ = 374337216.

The previous prime is 1158728539. The next prime is 1158728579. The reversal of 1158728556 is 6558278511.

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 15 ways as a sum of consecutive naturals, for example, 111811 + ... + 121733.

It is an arithmetic number, because the mean of its divisors is an integer number (58075248).

Almost surely, 2^1158728556 is an apocalyptic number.

It is an amenable number.

1158728556 is an abundant number, since it is smaller than the sum of its proper divisors (1628883348).

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

1158728556 is a wasteful number, since it uses less digits than its factorization.

1158728556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10230 (or 10228 counting only the distinct ones).

The product of its digits is 672000, while the sum is 48.

The square root of 1158728556 is about 34040.1021737597. The cubic root of 1158728556 is about 1050.3335466409. Note that the first 3 decimals are identical.

The spelling of 1158728556 in words is "one billion, one hundred fifty-eight million, seven hundred twenty-eight thousand, five hundred fifty-six".