779220 has 120 divisors (see below), whose sum is σ = 2703624. Its totient is φ = 186624.

The previous prime is 779189. The next prime is 779221. The reversal of 779220 is 22977.

It can be written as a sum of positive squares in 4 ways, for example, as 93636 + 685584 = 306^2 + 828^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (779221) by changing a digit.

779220 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 21042 + ... + 21078.

2⁷⁷⁹²²⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 779220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1351812).

779220 is an abundant number, since it is smaller than the sum of its proper divisors (1924404).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

779220 is a wasteful number, since it uses less digits than its factorization.

779220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71 (or 60 counting only the distinct ones).

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

The square root of 779220 is about 882.7343881372. The cubic root of 779220 is about 92.0209467112.

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

The spelling of 779220 in words is "seven hundred seventy-nine thousand, two hundred twenty".