2721660 has 24 divisors (see below), whose sum is σ = 7620816. Its totient is φ = 725760.

The previous prime is 2721619. The next prime is 2721671. The reversal of 2721660 is 661272.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 2721660.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22621 + ... + 22740.

It is an arithmetic number, because the mean of its divisors is an integer number (317534).

2^2721660 is an apocalyptic number.

2721660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2721660 is an abundant number, since it is smaller than the sum of its proper divisors (4899156).

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

2721660 is a wasteful number, since it uses less digits than its factorization.

2721660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45373 (or 45371 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 2721660 is about 1649.7454349081. The cubic root of 2721660 is about 139.6190322790.

The spelling of 2721660 in words is "two million, seven hundred twenty-one thousand, six hundred sixty".