9779220 has 108 divisors (see below), whose sum is σ = 32678100. Its totient is φ = 2365440.

The previous prime is 9779207. The next prime is 9779239. The reversal of 9779220 is 229779.

It can be written as a sum of positive squares in 2 ways, for example, as 4743684 + 5035536 = 2178^2 + 2244^2 .

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 21556 + ... + 22004.

It is an arithmetic number, because the mean of its divisors is an integer number (302575).

Almost surely, 2^9779220 is an apocalyptic number.

9779220 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9779220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16339050).

9779220 is an abundant number, since it is smaller than the sum of its proper divisors (22898880).

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

9779220 is a wasteful number, since it uses less digits than its factorization.

9779220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486 (or 470 counting only the distinct ones).

The product of its (nonzero) digits is 15876, while the sum is 36.

The square root of 9779220 is about 3127.1744434873. The cubic root of 9779220 is about 213.8461350676.

It can be divided in two parts, 9779 and 220, that added together give a palindrome (9999).

The spelling of 9779220 in words is "nine million, seven hundred seventy-nine thousand, two hundred twenty".