1128185856 has 180 divisors, whose sum is σ = 3728098192. Its totient is φ = 322043904.

The previous prime is 1128185843. The next prime is 1128185867. The reversal of 1128185856 is 6585818211.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1031646 + ... + 1032738.

Almost surely, 2^1128185856 is an apocalyptic number.

1128185856 is a gapful number since it is divisible by the number (16) 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 1128185856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1864049096).

1128185856 is an abundant number, since it is smaller than the sum of its proper divisors (2599912336).

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

1128185856 is an equidigital number, since it uses as much as digits as its factorization.

1128185856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1134 (or 1105 counting only the distinct ones).

The product of its digits is 153600, while the sum is 45.

The square root of 1128185856 is about 33588.4780244655. The cubic root of 1128185856 is about 1041.0227414356.

The spelling of 1128185856 in words is "one billion, one hundred twenty-eight million, one hundred eighty-five thousand, eight hundred fifty-six".