2521660 has 24 divisors (see below), whose sum is σ = 5387760. Its totient is φ = 991104.

The previous prime is 2521643. The next prime is 2521681. The reversal of 2521660 is 661252.

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, 112 + ... + 2248.

It is an arithmetic number, because the mean of its divisors is an integer number (224490).

2^2521660 is an apocalyptic number.

2521660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2521660 is an abundant number, since it is smaller than the sum of its proper divisors (2866100).

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

2521660 is a wasteful number, since it uses less digits than its factorization.

2521660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2205 (or 2203 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 2521660 is about 1587.9735514170. The cubic root of 2521660 is about 136.1117161650. Note that the first 3 decimals are identical.

The spelling of 2521660 in words is "two million, five hundred twenty-one thousand, six hundred sixty".