90789 has 8 divisors (see below), whose sum is σ = 123552. Its totient is φ = 59280.

The previous prime is 90787. The next prime is 90793. The reversal of 90789 is 98709.

90789 = T₃₀ + T₃₁ + ... + T₈₂.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 90789 - 2¹ = 90787 is a prime.

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

It is a congruent number.

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 in 7 ways as a sum of consecutive naturals, for example, 127 + ... + 444.

It is an arithmetic number, because the mean of its divisors is an integer number (15444).

2⁹⁰⁷⁸⁹ is an apocalyptic number.

It is an amenable number.

90789 is a deficient number, since it is larger than the sum of its proper divisors (32763).

90789 is a wasteful number, since it uses less digits than its factorization.

90789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627.

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 90789 is about 301.3121305225. The cubic root of 90789 is about 44.9446232396.

The spelling of 90789 in words is "ninety thousand, seven hundred eighty-nine".