220779 has 32 divisors (see below), whose sum is σ = 383040. Its totient is φ = 124416.

The previous prime is 220771. The next prime is 220783. The reversal of 220779 is 977022.

It is not a de Polignac number, because 220779 - 2³ = 220771 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (220771) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5949 + ... + 5985.

It is an arithmetic number, because the mean of its divisors is an integer number (11970).

2²²⁰⁷⁷⁹ is an apocalyptic number.

220779 is a deficient number, since it is larger than the sum of its proper divisors (162261).

220779 is a wasteful number, since it uses less digits than its factorization.

220779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76 (or 70 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 27.

The square root of 220779 is about 469.8712589636. The cubic root of 220779 is about 60.4392760934.

It can be divided in two parts, 220 and 779, that added together give a palindrome (999).

The spelling of 220779 in words is "two hundred twenty thousand, seven hundred seventy-nine".