1115866128 has 160 divisors (see below), whose sum is σ = 3377033856. Its totient is φ = 314302464.

The previous prime is 1115866117. The next prime is 1115866133. The reversal of 1115866128 is 8216685111.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 391075 + ... + 393917.

Almost surely, 2^1115866128 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 1115866128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1688516928).

1115866128 is an abundant number, since it is smaller than the sum of its proper divisors (2261167728).

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

1115866128 is a wasteful number, since it uses less digits than its factorization.

1115866128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2921 (or 2915 counting only the distinct ones).

The product of its digits is 23040, while the sum is 39.

The square root of 1115866128 is about 33404.5824401384. The cubic root of 1115866128 is about 1037.2195602992.

The spelling of 1115866128 in words is "one billion, one hundred fifteen million, eight hundred sixty-six thousand, one hundred twenty-eight".