1128397928 has 32 divisors (see below), whose sum is σ = 2419502400. Its totient is φ = 483297792.

The previous prime is 1128397927. The next prime is 1128397939. The reversal of 1128397928 is 8297938211.

It is not an unprimeable number, because it can be changed into a prime (1128397927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100451 + ... + 111117.

It is an arithmetic number, because the mean of its divisors is an integer number (75609450).

Almost surely, 2^1128397928 is an apocalyptic number.

It is an amenable number.

1128397928 is an abundant number, since it is smaller than the sum of its proper divisors (1291104472).

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

1128397928 is a wasteful number, since it uses less digits than its factorization.

1128397928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12569 (or 12565 counting only the distinct ones).

The product of its digits is 435456, while the sum is 50.

The square root of 1128397928 is about 33591.6347920133. The cubic root of 1128397928 is about 1041.0879664874.

The spelling of 1128397928 in words is "one billion, one hundred twenty-eight million, three hundred ninety-seven thousand, nine hundred twenty-eight".