90445 has 4 divisors (see below), whose sum is σ = 108540. Its totient is φ = 72352.

The previous prime is 90439. The next prime is 90469. The reversal of 90445 is 54409.

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 60516 + 29929 = 246^2 + 173^2 .

It is a cyclic number.

It is not a de Polignac number, because 90445 - 2³ = 90437 is a prime.

It is a nialpdrome in base 12.

It is a zygodrome in base 12.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9040 + ... + 9049.

It is an arithmetic number, because the mean of its divisors is an integer number (27135).

2⁹⁰⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

90445 is a deficient number, since it is larger than the sum of its proper divisors (18095).

90445 is a wasteful number, since it uses less digits than its factorization.

90445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18094.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 90445 is about 300.7407521438. The cubic root of 90445 is about 44.8877862557.

It can be divided in two parts, 904 and 45, that added together give a palindrome (949).

The spelling of 90445 in words is "ninety thousand, four hundred forty-five".