90689329909 has 4 divisors (see below), whose sum is σ = 91521342220. Its totient is φ = 89857317600.

The previous prime is 90689329877. The next prime is 90689329937. The reversal of 90689329909 is 90992398609.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 56321731684 + 34367598225 = 237322^2 + 185385^2 .

It is a cyclic number.

It is not a de Polignac number, because 90689329909 - 2⁵ = 90689329877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90689324909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 416005992 + ... + 416006209.

It is an arithmetic number, because the mean of its divisors is an integer number (22880335555).

Almost surely, 2^90689329909 is an apocalyptic number.

It is an amenable number.

90689329909 is a deficient number, since it is larger than the sum of its proper divisors (832012311).

90689329909 is a wasteful number, since it uses less digits than its factorization.

90689329909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832012310.

The product of its (nonzero) digits is 17006112, while the sum is 64.

The spelling of 90689329909 in words is "ninety billion, six hundred eighty-nine million, three hundred twenty-nine thousand, nine hundred nine".