2665780 has 24 divisors (see below), whose sum is σ = 6029352. Its totient is φ = 984192.

The previous prime is 2665771. The next prime is 2665781. The reversal of 2665780 is 875662.

It can be written as a sum of positive squares in 4 ways, for example, as 21904 + 2643876 = 148^2 + 1626^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2665781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4867 + ... + 5386.

It is an arithmetic number, because the mean of its divisors is an integer number (251223).

2^2665780 is an apocalyptic number.

2665780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2665780 is an abundant number, since it is smaller than the sum of its proper divisors (3363572).

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

2665780 is a wasteful number, since it uses less digits than its factorization.

2665780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10275 (or 10273 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 2665780 is about 1632.7216541713. The cubic root of 2665780 is about 138.6568836581.

The spelling of 2665780 in words is "two million, six hundred sixty-five thousand, seven hundred eighty".