2661330 has 128 divisors (see below), whose sum is σ = 8294400. Its totient is φ = 532224.

The previous prime is 2661317. The next prime is 2661331. The reversal of 2661330 is 331662.

2661330 is nontrivially palindromic in base 11.

2661330 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a junction number, because it is equal to n+sod(n) for n = 2661297 and 2661306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 91756 + ... + 91784.

It is an arithmetic number, because the mean of its divisors is an integer number (64800).

2^2661330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2661330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4147200).

2661330 is an abundant number, since it is smaller than the sum of its proper divisors (5633070).

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

2661330 is a wasteful number, since it uses less digits than its factorization.

2661330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88.

The product of its (nonzero) digits is 648, while the sum is 21.

The square root of 2661330 is about 1631.3583297363. The cubic root of 2661330 is about 138.5796871422.

Adding to 2661330 its reverse (331662), we get a palindrome (2992992).

It can be divided in two parts, 266 and 1330, that added together give a triangular number (1596 = T₅₆).

The spelling of 2661330 in words is "two million, six hundred sixty-one thousand, three hundred thirty".