1068731809 has 8 divisors (see below), whose sum is σ = 1170619560. Its totient is φ = 971179776.

The previous prime is 1068731771. The next prime is 1068731827. The reversal of 1068731809 is 9081378601.

It can be written as a sum of positive squares in 4 ways, for example, as 428490000 + 640241809 = 20700^2 + 25303^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1068731809 is a prime.

It is a super-2 number, since 2×1068731809² = 2284375359136824962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1068731849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1083414 + ... + 1084399.

It is an arithmetic number, because the mean of its divisors is an integer number (146327445).

Almost surely, 2^1068731809 is an apocalyptic number.

It is an amenable number.

1068731809 is a deficient number, since it is larger than the sum of its proper divisors (101887751).

1068731809 is a wasteful number, since it uses less digits than its factorization.

1068731809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2167859.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 1068731809 is about 32691.4638552635. The cubic root of 1068731809 is about 1022.4048756266.

The spelling of 1068731809 in words is "one billion, sixty-eight million, seven hundred thirty-one thousand, eight hundred nine".