1081904688 has 200 divisors, whose sum is σ = 3362396400. Its totient is φ = 334803456.

The previous prime is 1081904647. The next prime is 1081904689. The reversal of 1081904688 is 8864091801.

It is not an unprimeable number, because it can be changed into a prime (1081904689) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1304658 + ... + 1305486.

It is an arithmetic number, because the mean of its divisors is an integer number (16811982).

Almost surely, 2^1081904688 is an apocalyptic number.

1081904688 is a gapful number since it is divisible by the number (18) 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 1081904688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1681198200).

1081904688 is an abundant number, since it is smaller than the sum of its proper divisors (2280491712).

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

1081904688 is a wasteful number, since it uses less digits than its factorization.

1081904688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 921 (or 906 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 45.

The square root of 1081904688 is about 32892.3195898374. The cubic root of 1081904688 is about 1026.5883565014.

The spelling of 1081904688 in words is "one billion, eighty-one million, nine hundred four thousand, six hundred eighty-eight".