90784 has 12 divisors (see below), whose sum is σ = 178794. Its totient is φ = 45376.

The previous prime is 90749. The next prime is 90787. The reversal of 90784 is 48709.

It can be written as a sum of positive squares in only one way, i.e., 90000 + 784 = 300^2 + 28^2 .

It is not an unprimeable number, because it can be changed into a prime (90787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1387 + ... + 1450.

2⁹⁰⁷⁸⁴ is an apocalyptic number.

It is an amenable number.

90784 is a deficient number, since it is larger than the sum of its proper divisors (88010).

90784 is a wasteful number, since it uses less digits than its factorization.

90784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2847 (or 2839 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 90784 is about 301.3038333643. The cubic root of 90784 is about 44.9437981498.

The spelling of 90784 in words is "ninety thousand, seven hundred eighty-four".