1128865920 has 576 divisors, whose sum is σ = 4596315840. Its totient is φ = 234823680.

The previous prime is 1128865897. The next prime is 1128865937. The reversal of 1128865920 is 295688211.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 15899485 + ... + 15899555.

It is an arithmetic number, because the mean of its divisors is an integer number (7979715).

Almost surely, 2^1128865920 is an apocalyptic number.

1128865920 is a gapful number since it is divisible by the number (10) 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 1128865920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2298157920).

1128865920 is an abundant number, since it is smaller than the sum of its proper divisors (3467449920).

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

1128865920 is a wasteful number, since it uses less digits than its factorization.

1128865920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133 (or 101 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 42.

The square root of 1128865920 is about 33598.5999708321. The cubic root of 1128865920 is about 1041.2318736105.

The spelling of 1128865920 in words is "one billion, one hundred twenty-eight million, eight hundred sixty-five thousand, nine hundred twenty".