2661320 has 16 divisors (see below), whose sum is σ = 5988060. Its totient is φ = 1064512.

The previous prime is 2661317. The next prime is 2661331. The reversal of 2661320 is 231662.

It can be written as a sum of positive squares in 2 ways, for example, as 2515396 + 145924 = 1586^2 + 382^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 2661292 and 2661301.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33227 + ... + 33306.

2^2661320 is an apocalyptic number.

2661320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2661320 is an abundant number, since it is smaller than the sum of its proper divisors (3326740).

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

2661320 is a wasteful number, since it uses less digits than its factorization.

2661320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66544 (or 66540 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 2661320 is about 1631.3552648029. The cubic root of 2661320 is about 138.5795135700.

Adding to 2661320 its reverse (231662), we get a palindrome (2892982).

The spelling of 2661320 in words is "two million, six hundred sixty-one thousand, three hundred twenty".