90658 has 4 divisors (see below), whose sum is σ = 135990. Its totient is φ = 45328.

The previous prime is 90647. The next prime is 90659. The reversal of 90658 is 85609.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85609 = 59 ⋅1451.

It can be written as a sum of positive squares in only one way, i.e., 74529 + 16129 = 273^2 + 127^2 .

It is a plaindrome in base 12 and base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22663 + ... + 22666.

2⁹⁰⁶⁵⁸ is an apocalyptic number.

90658 is a deficient number, since it is larger than the sum of its proper divisors (45332).

90658 is a wasteful number, since it uses less digits than its factorization.

90658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45331.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 90658 is about 301.0946694978. The cubic root of 90658 is about 44.9229958775.

The spelling of 90658 in words is "ninety thousand, six hundred fifty-eight".