90689 has 4 divisors (see below), whose sum is σ = 94656. Its totient is φ = 86724.

The previous prime is 90679. The next prime is 90697. The reversal of 90689 is 98609.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98609 = 7 ⋅14087.

It is a cyclic number.

It is not a de Polignac number, because 90689 - 2¹⁶ = 25153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90619) 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, 1949 + ... + 1994.

It is an arithmetic number, because the mean of its divisors is an integer number (23664).

2⁹⁰⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

90689 is a deficient number, since it is larger than the sum of its proper divisors (3967).

90689 is a wasteful number, since it uses less digits than its factorization.

90689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3966.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 90689 is about 301.1461439235. The cubic root of 90689 is about 44.9281156837.

The spelling of 90689 in words is "ninety thousand, six hundred eighty-nine".