90243473 has 4 divisors (see below), whose sum is σ = 90346788. Its totient is φ = 90140160.

The previous prime is 90243457. The next prime is 90243487. The reversal of 90243473 is 37434209.

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 39790864 + 50452609 = 6308^2 + 7103^2 .

It is a cyclic number.

It is not a de Polignac number, because 90243473 - 2⁴ = 90243457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90243073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50336 + ... + 52097.

It is an arithmetic number, because the mean of its divisors is an integer number (22586697).

Almost surely, 2^90243473 is an apocalyptic number.

It is an amenable number.

90243473 is a deficient number, since it is larger than the sum of its proper divisors (103315).

90243473 is a wasteful number, since it uses less digits than its factorization.

90243473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103314.

The product of its (nonzero) digits is 18144, while the sum is 32.

The square root of 90243473 is about 9499.6564674729. The cubic root of 90243473 is about 448.5442222970.

The spelling of 90243473 in words is "ninety million, two hundred forty-three thousand, four hundred seventy-three".