90812 has 12 divisors (see below), whose sum is σ = 161616. Its totient is φ = 44640.

The previous prime is 90803. The next prime is 90821. The reversal of 90812 is 21809.

It is an interprime number because it is at equal distance from previous prime (90803) and next prime (90821).

It is an Ulam number.

It is a plaindrome in base 12.

It is a congruent number.

It is an unprimeable number.

90812 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 in 3 ways as a sum of consecutive naturals, for example, 137 + ... + 447.

It is an arithmetic number, because the mean of its divisors is an integer number (13468).

2⁹⁰⁸¹² is an apocalyptic number.

It is an amenable number.

90812 is a deficient number, since it is larger than the sum of its proper divisors (70804).

90812 is a wasteful number, since it uses less digits than its factorization.

90812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388 (or 386 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 90812 is about 301.3502945079. The cubic root of 90812 is about 44.9484182627.

The spelling of 90812 in words is "ninety thousand, eight hundred twelve".