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2660 = 225719
BaseRepresentation
bin101001100100
310122112
4221210
541120
620152
710520
oct5144
93575
102660
111aa9
121658
131298
14d80
15bc5
hexa64

2660 has 24 divisors (see below), whose sum is σ = 6720. Its totient is φ = 864.

The previous prime is 2659. The next prime is 2663. The reversal of 2660 is 662.

2660 divided by its sum of digits (14) gives a triangular number (190 = T19).

2660 = T24 + T25 + ... + T30.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is an Ulam number.

It is a nialpdrome in base 14 and base 16.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 2660.

It is not an unprimeable number, because it can be changed into a prime (2663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131 + ... + 149.

It is an arithmetic number, because the mean of its divisors is an integer number (280).

2660 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 2660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3360).

2660 is an abundant number, since it is smaller than the sum of its proper divisors (4060).

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

2660 is a wasteful number, since it uses less digits than its factorization.

2660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35 (or 33 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 2660 is about 51.5751878329. The cubic root of 2660 is about 13.8556598224.

The spelling of 2660 in words is "two thousand, six hundred sixty".