185664089 has 8 divisors (see below), whose sum is σ = 211707720. Its totient is φ = 161300736.

The previous prime is 185664071. The next prime is 185664103. The reversal of 185664089 is 980466581.

It can be written as a sum of positive squares in 4 ways, for example, as 17572864 + 168091225 = 4192^2 + 12965^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 185664089 - 2¹² = 185659993 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (185669089) 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, 419834 + ... + 420275.

It is an arithmetic number, because the mean of its divisors is an integer number (26463465).

Almost surely, 2^185664089 is an apocalyptic number.

It is an amenable number.

185664089 is a deficient number, since it is larger than the sum of its proper divisors (26043631).

185664089 is a wasteful number, since it uses less digits than its factorization.

185664089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840139.

The product of its (nonzero) digits is 414720, while the sum is 47.

The square root of 185664089 is about 13625.8610370134. The cubic root of 185664089 is about 570.4829076800.

The spelling of 185664089 in words is "one hundred eighty-five million, six hundred sixty-four thousand, eighty-nine".