1128729900 has 36 divisors (see below), whose sum is σ = 3265792712. Its totient is φ = 300994560.

The previous prime is 1128729893. The next prime is 1128729907. The reversal of 1128729900 is 99278211.

It is an interprime number because it is at equal distance from previous prime (1128729893) and next prime (1128729907).

It is not an unprimeable number, because it can be changed into a prime (1128729907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1880917 + ... + 1881516.

Almost surely, 2^1128729900 is an apocalyptic number.

1128729900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1128729900 is an abundant number, since it is smaller than the sum of its proper divisors (2137062812).

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

1128729900 is a wasteful number, since it uses less digits than its factorization.

1128729900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3762450 (or 3762443 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 39.

The square root of 1128729900 is about 33596.5757183675. The cubic root of 1128729900 is about 1041.1900516823.

The spelling of 1128729900 in words is "one billion, one hundred twenty-eight million, seven hundred twenty-nine thousand, nine hundred".