2661280 has 24 divisors (see below), whose sum is σ = 6287652. Its totient is φ = 1064448.

The previous prime is 2661271. The next prime is 2661283. The reversal of 2661280 is 821662.

It can be written as a sum of positive squares in 2 ways, for example, as 2471184 + 190096 = 1572^2 + 436^2 .

It is a super-2 number, since 2×2661280² = 14164822476800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2661283) 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, 8157 + ... + 8476.

2^2661280 is an apocalyptic number.

2661280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2661280 is an abundant number, since it is smaller than the sum of its proper divisors (3626372).

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

2661280 is a wasteful number, since it uses less digits than its factorization.

2661280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16648 (or 16640 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 2661280 is about 1631.3430050115. The cubic root of 2661280 is about 138.5788192769.

The spelling of 2661280 in words is "two million, six hundred sixty-one thousand, two hundred eighty".