56789 has 4 divisors (see below), whose sum is σ = 57420. Its totient is φ = 56160.

The previous prime is 56783. The next prime is 56807. The reversal of 56789 is 98765.

56789 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 98765 = 5 ⋅19753.

It can be written as a sum of positive squares in 2 ways, for example, as 27889 + 28900 = 167^2 + 170^2 .

It is a cyclic number.

It is not a de Polignac number, because 56789 - 2⁴ = 56773 is a prime.

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

It is a Duffinian number.

Its product of digits (15120) is a multiple of the sum of its prime divisors (630).

It is a straight-line number, since its digits are in arithmetic progression.

It is a plaindrome in base 10.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152 + ... + 369.

It is an arithmetic number, because the mean of its divisors is an integer number (14355).

2⁵⁶⁷⁸⁹ is an apocalyptic number.

It is an amenable number.

56789 is a deficient number, since it is larger than the sum of its proper divisors (631).

56789 is a wasteful number, since it uses less digits than its factorization.

56789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630.

The product of its digits is 15120, while the sum is 35.

The square root of 56789 is about 238.3044271515. The cubic root of 56789 is about 38.4374652433.

It can be divided in two parts, 567 and 89, that added together give a palindrome (656).

The spelling of 56789 in words is "fifty-six thousand, seven hundred eighty-nine".