768721109 has 8 divisors (see below), whose sum is σ = 828626232. Its totient is φ = 708926400.

The previous prime is 768721103. The next prime is 768721117. The reversal of 768721109 is 901127867.

768721109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 306600100 + 462121009 = 17510^2 + 21497^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-768721109 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (768721103) 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, 12842 + ... + 41259.

It is an arithmetic number, because the mean of its divisors is an integer number (103578279).

Almost surely, 2^768721109 is an apocalyptic number.

It is an amenable number.

768721109 is a deficient number, since it is larger than the sum of its proper divisors (59905123).

768721109 is a wasteful number, since it uses less digits than its factorization.

768721109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55207.

The product of its (nonzero) digits is 42336, while the sum is 41.

The square root of 768721109 is about 27725.8202583801. The cubic root of 768721109 is about 916.0579237380.

The spelling of 768721109 in words is "seven hundred sixty-eight million, seven hundred twenty-one thousand, one hundred nine".