90245 has 4 divisors (see below), whose sum is σ = 108300. Its totient is φ = 72192.

The previous prime is 90239. The next prime is 90247. The reversal of 90245 is 54209.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54209 = 151 ⋅359.

It can be written as a sum of positive squares in 2 ways, for example, as 57121 + 33124 = 239^2 + 182^2 .

It is a cyclic number.

It is not a de Polignac number, because 90245 - 2⁸ = 89989 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90247) 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, 9020 + ... + 9029.

It is an arithmetic number, because the mean of its divisors is an integer number (27075).

2⁹⁰²⁴⁵ is an apocalyptic number.

It is an amenable number.

90245 is a deficient number, since it is larger than the sum of its proper divisors (18055).

90245 is a wasteful number, since it uses less digits than its factorization.

90245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18054.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 90245 is about 300.4080558174. The cubic root of 90245 is about 44.8546752205.

The spelling of 90245 in words is "ninety thousand, two hundred forty-five".