90518 has 4 divisors (see below), whose sum is σ = 135780. Its totient is φ = 45258.

The previous prime is 90511. The next prime is 90523. The reversal of 90518 is 81509.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 90493 and 90502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90511) by changing a digit.

90518 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22628 + ... + 22631.

It is an arithmetic number, because the mean of its divisors is an integer number (33945).

2⁹⁰⁵¹⁸ is an apocalyptic number.

90518 is a deficient number, since it is larger than the sum of its proper divisors (45262).

90518 is a wasteful number, since it uses less digits than its factorization.

90518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45261.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 90518 is about 300.8620946547. The cubic root of 90518 is about 44.8998596233.

Subtracting from 90518 its reverse (81509), we obtain a palindrome (9009).

It can be divided in two parts, 905 and 18, that multiplied together give a triangular number (16290 = T₁₈₀).

The spelling of 90518 in words is "ninety thousand, five hundred eighteen".