1809868688 has 40 divisors (see below), whose sum is σ = 3716380440. Its totient is φ = 850903040.

The previous prime is 1809868673. The next prime is 1809868729. The reversal of 1809868688 is 8868689081.

It can be written as a sum of positive squares in 4 ways, for example, as 360696064 + 1449172624 = 18992^2 + 38068^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1809868688.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 367748 + ... + 372636.

It is an arithmetic number, because the mean of its divisors is an integer number (92909511).

Almost surely, 2^1809868688 is an apocalyptic number.

It is an amenable number.

1809868688 is an abundant number, since it is smaller than the sum of its proper divisors (1906511752).

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

1809868688 is a wasteful number, since it uses less digits than its factorization.

1809868688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6275 (or 6269 counting only the distinct ones).

The product of its (nonzero) digits is 10616832, while the sum is 62.

The square root of 1809868688 is about 42542.5514984703. The cubic root of 1809868688 is about 1218.6594358547.

The spelling of 1809868688 in words is "one billion, eight hundred nine million, eight hundred sixty-eight thousand, six hundred eighty-eight".