2665620 has 72 divisors (see below), whose sum is σ = 8255520. Its totient is φ = 696000.

The previous prime is 2665601. The next prime is 2665627. The reversal of 2665620 is 265662.

2665620 is a `hidden beast` number, since 2 + 6 + 656 + 2 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2665627) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10495 + ... + 10745.

It is an arithmetic number, because the mean of its divisors is an integer number (114660).

2^2665620 is an apocalyptic number.

2665620 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 2665620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4127760).

2665620 is an abundant number, since it is smaller than the sum of its proper divisors (5589900).

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

2665620 is a wasteful number, since it uses less digits than its factorization.

2665620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325 (or 320 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 2665620 is about 1632.6726554947. The cubic root of 2665620 is about 138.6541095426.

It can be divided in two parts, 266 and 5620, that added together give a triangular number (5886 = T₁₀₈).

The spelling of 2665620 in words is "two million, six hundred sixty-five thousand, six hundred twenty".