2281640 has 16 divisors (see below), whose sum is σ = 5133780. Its totient is φ = 912640.

The previous prime is 2281619. The next prime is 2281651. The reversal of 2281640 is 461822.

It can be written as a sum of positive squares in 2 ways, for example, as 2244004 + 37636 = 1498^2 + 194^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28481 + ... + 28560.

2^2281640 is an apocalyptic number.

2281640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2281640 is an abundant number, since it is smaller than the sum of its proper divisors (2852140).

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

2281640 is a wasteful number, since it uses less digits than its factorization.

2281640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57052 (or 57048 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 2281640 is about 1510.5098477004. The cubic root of 2281640 is about 131.6484370069.

The spelling of 2281640 in words is "two million, two hundred eighty-one thousand, six hundred forty".