2663220 has 96 divisors (see below), whose sum is σ = 9047808. Its totient is φ = 571392.

The previous prime is 2663209. The next prime is 2663231. The reversal of 2663220 is 223662.

It is an interprime number because it is at equal distance from previous prime (2663209) and next prime (2663231).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6954 + ... + 7326.

It is an arithmetic number, because the mean of its divisors is an integer number (94248).

2^2663220 is an apocalyptic number.

2663220 is a gapful number since it is divisible by the number (20) 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 2663220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4523904).

2663220 is an abundant number, since it is smaller than the sum of its proper divisors (6384588).

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

2663220 is a wasteful number, since it uses less digits than its factorization.

2663220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409 (or 407 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 2663220 is about 1631.9374988032. The cubic root of 2663220 is about 138.6124844818.

Adding to 2663220 its reverse (223662), we get a palindrome (2886882).

It can be divided in two parts, 266 and 3220, that added together give a triangular number (3486 = T₈₃).

The spelling of 2663220 in words is "two million, six hundred sixty-three thousand, two hundred twenty".