1809698688 has 384 divisors, whose sum is σ = 6469182720. Its totient is φ = 473776128.

The previous prime is 1809698663. The next prime is 1809698699. The reversal of 1809698688 is 8868969081.

It is a tau number, because it is divible by the number of its divisors (384).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5894631 + ... + 5894937.

It is an arithmetic number, because the mean of its divisors is an integer number (16846830).

Almost surely, 2^1809698688 is an apocalyptic number.

1809698688 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 1809698688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3234591360).

1809698688 is an abundant number, since it is smaller than the sum of its proper divisors (4659484032).

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

1809698688 is a wasteful number, since it uses less digits than its factorization.

1809698688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394 (or 379 counting only the distinct ones).

The product of its (nonzero) digits is 11943936, while the sum is 63.

The square root of 1809698688 is about 42540.5534519710. The cubic root of 1809698688 is about 1218.6212786498.

The spelling of 1809698688 in words is "one billion, eight hundred nine million, six hundred ninety-eight thousand, six hundred eighty-eight".