2631220 has 12 divisors (see below), whose sum is σ = 5525604. Its totient is φ = 1052480.

The previous prime is 2631217. The next prime is 2631221. The reversal of 2631220 is 221362.

It can be written as a sum of positive squares in 2 ways, for example, as 1313316 + 1317904 = 1146^2 + 1148^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2631194 and 2631203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2631221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65761 + ... + 65800.

It is an arithmetic number, because the mean of its divisors is an integer number (460467).

2^2631220 is an apocalyptic number.

2631220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2631220 is an abundant number, since it is smaller than the sum of its proper divisors (2894384).

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

2631220 is a wasteful number, since it uses less digits than its factorization.

2631220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131570 (or 131568 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 2631220 is about 1622.1035725255. The cubic root of 2631220 is about 138.0550784833.

Adding to 2631220 its reverse (221362), we get a palindrome (2852582).

The spelling of 2631220 in words is "two million, six hundred thirty-one thousand, two hundred twenty".