2644660 has 12 divisors (see below), whose sum is σ = 5553828. Its totient is φ = 1057856.

The previous prime is 2644657. The next prime is 2644669. The reversal of 2644660 is 664462.

It can be written as a sum of positive squares in 2 ways, for example, as 996004 + 1648656 = 998^2 + 1284^2 .

It is a d-powerful number, because it can be written as 2²¹ + 6² + 4⁶ + 4⁹ + 6⁴ + 6⁷ + 0 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2644669) 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, 66097 + ... + 66136.

It is an arithmetic number, because the mean of its divisors is an integer number (462819).

2^2644660 is an apocalyptic number.

2644660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2644660 is an abundant number, since it is smaller than the sum of its proper divisors (2909168).

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

2644660 is a wasteful number, since it uses less digits than its factorization.

2644660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132242 (or 132240 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 2644660 is about 1626.2410645412. The cubic root of 2644660 is about 138.2897364268.

The spelling of 2644660 in words is "two million, six hundred forty-four thousand, six hundred sixty".