1100990128 has 40 divisors (see below), whose sum is σ = 2543908608. Its totient is φ = 451336512.

The previous prime is 1100990123. The next prime is 1100990129. The reversal of 1100990128 is 8210990011.

It is a self number, because there is not a number n which added to its sum of digits gives 1100990128.

It is not an unprimeable number, because it can be changed into a prime (1100990123) 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, 211126 + ... + 216277.

Almost surely, 2^1100990128 is an apocalyptic number.

It is an amenable number.

1100990128 is an abundant number, since it is smaller than the sum of its proper divisors (1442918480).

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

1100990128 is a wasteful number, since it uses less digits than its factorization.

1100990128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427441 (or 427435 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 31.

The square root of 1100990128 is about 33181.1712873431. The cubic root of 1100990128 is about 1032.5897466482.

The spelling of 1100990128 in words is "one billion, one hundred million, nine hundred ninety thousand, one hundred twenty-eight".