1181155328 has 68 divisors (see below), whose sum is σ = 2406463560. Its totient is φ = 579600384.

The previous prime is 1181155319. The next prime is 1181155357. The reversal of 1181155328 is 8235511811.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4390778 + ... + 4391046.

It is an arithmetic number, because the mean of its divisors is an integer number (35389170).

Almost surely, 2^1181155328 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1181155328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1203231780).

1181155328 is an abundant number, since it is smaller than the sum of its proper divisors (1225308232).

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

1181155328 is an frugal number, since it uses more digits than its factorization.

1181155328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368 (or 338 counting only the distinct ones).

The product of its digits is 9600, while the sum is 35.

The square root of 1181155328 is about 34367.9404096318. The cubic root of 1181155328 is about 1057.0665685530.

The spelling of 1181155328 in words is "one billion, one hundred eighty-one million, one hundred fifty-five thousand, three hundred twenty-eight".