90243665 has 16 divisors (see below), whose sum is σ = 111767040. Its totient is φ = 69905280.

The previous prime is 90243649. The next prime is 90243689. The reversal of 90243665 is 56634209.

It is not a de Polignac number, because 90243665 - 2⁴ = 90243649 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26912 + ... + 30078.

It is an arithmetic number, because the mean of its divisors is an integer number (6985440).

Almost surely, 2^90243665 is an apocalyptic number.

It is an amenable number.

90243665 is a deficient number, since it is larger than the sum of its proper divisors (21523375).

90243665 is a wasteful number, since it uses less digits than its factorization.

90243665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3352.

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 90243665 is about 9499.6665730961. Note that the first 3 decimals coincide. The cubic root of 90243665 is about 448.5445404010.

The spelling of 90243665 in words is "ninety million, two hundred forty-three thousand, six hundred sixty-five".