1089900000 has 432 divisors, whose sum is σ = 4453027488. Its totient is φ = 247680000.

The previous prime is 1089899977. The next prime is 1089900017. The reversal of 1089900000 is 99801.

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, 6299914 + ... + 6300086.

It is an arithmetic number, because the mean of its divisors is an integer number (10307934).

Almost surely, 2^1089900000 is an apocalyptic number.

1089900000 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 1089900000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2226513744).

1089900000 is an abundant number, since it is smaller than the sum of its proper divisors (3363127488).

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

1089900000 is an equidigital number, since it uses as much as digits as its factorization.

1089900000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221 (or 190 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 1089900000 is about 33013.6335473695. The cubic root of 1089900000 is about 1029.1109933623.

Adding to 1089900000 its reverse (99801), we get a palindrome (1089999801).

The spelling of 1089900000 in words is "one billion, eighty-nine million, nine hundred thousand".