90723 has 4 divisors (see below), whose sum is σ = 120968. Its totient is φ = 60480.

The previous prime is 90709. The next prime is 90731. The reversal of 90723 is 32709.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32709 = 3 ⋅10903.

It is not a de Polignac number, because 90723 - 2⁶ = 90659 is a prime.

It is a D-number.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90723.

It is not an unprimeable number, because it can be changed into a prime (90703) 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, 15118 + ... + 15123.

It is an arithmetic number, because the mean of its divisors is an integer number (30242).

2⁹⁰⁷²³ is an apocalyptic number.

90723 is a deficient number, since it is larger than the sum of its proper divisors (30245).

90723 is a wasteful number, since it uses less digits than its factorization.

90723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30244.

The product of its (nonzero) digits is 378, while the sum is 21.

The square root of 90723 is about 301.2025896303. The cubic root of 90723 is about 44.9337296136.

The spelling of 90723 in words is "ninety thousand, seven hundred twenty-three".