99768609 has 6 divisors (see below), whose sum is σ = 144110226. Its totient is φ = 66512400.

The previous prime is 99768593. The next prime is 99768637. The reversal of 99768609 is 90686799.

It can be written as a sum of positive squares in only one way, i.e., 99201600 + 567009 = 9960^2 + 753^2 .

It is not a de Polignac number, because 99768609 - 2⁴ = 99768593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99768649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5542692 + ... + 5542709.

It is an arithmetic number, because the mean of its divisors is an integer number (24018371).

Almost surely, 2^99768609 is an apocalyptic number.

It is an amenable number.

99768609 is a deficient number, since it is larger than the sum of its proper divisors (44341617).

99768609 is a wasteful number, since it uses less digits than its factorization.

99768609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11085407 (or 11085404 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 54.

The square root of 99768609 is about 9988.4237495212. The cubic root of 99768609 is about 463.8005995796.

The spelling of 99768609 in words is "ninety-nine million, seven hundred sixty-eight thousand, six hundred nine".