1155665328 has 80 divisors (see below), whose sum is σ = 3061518336. Its totient is φ = 375477760.

The previous prime is 1155665323. The next prime is 1155665359. The reversal of 1155665328 is 8235665511.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1155665328.

It is not an unprimeable number, because it can be changed into a prime (1155665323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 633025 + ... + 634847.

Almost surely, 2^1155665328 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 1155665328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1530759168).

1155665328 is an abundant number, since it is smaller than the sum of its proper divisors (1905853008).

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

1155665328 is a wasteful number, since it uses less digits than its factorization.

1155665328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2162 (or 2156 counting only the distinct ones).

The product of its digits is 216000, while the sum is 42.

The square root of 1155665328 is about 33995.0779966748. The cubic root of 1155665328 is about 1049.4071719293.

The spelling of 1155665328 in words is "one billion, one hundred fifty-five million, six hundred sixty-five thousand, three hundred twenty-eight".