1181028728 has 24 divisors (see below), whose sum is σ = 2434043640. Its totient is φ = 536830800.

The previous prime is 1181028701. The next prime is 1181028763. The reversal of 1181028728 is 8278201811.

It is a super-2 number, since 2×1181028728² = 2789657712722595968, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1181028691 and 1181028700.

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 609068 + ... + 611003.

It is an arithmetic number, because the mean of its divisors is an integer number (101418485).

Almost surely, 2^1181028728 is an apocalyptic number.

It is an amenable number.

1181028728 is an abundant number, since it is smaller than the sum of its proper divisors (1253014912).

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

1181028728 is a wasteful number, since it uses less digits than its factorization.

1181028728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1220099 (or 1220084 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 38.

The square root of 1181028728 is about 34366.0985274733. The cubic root of 1181028728 is about 1057.0288006134.

The spelling of 1181028728 in words is "one billion, one hundred eighty-one million, twenty-eight thousand, seven hundred twenty-eight".