2271690 has 48 divisors (see below), whose sum is σ = 6054048. Its totient is φ = 590688.

The previous prime is 2271683. The next prime is 2271721. The reversal of 2271690 is 961722.

It is a super-2 number, since 2×2271690² = 10321150912200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3577 + ... + 4163.

It is an arithmetic number, because the mean of its divisors is an integer number (126126).

2^2271690 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2271690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3027024).

2271690 is an abundant number, since it is smaller than the sum of its proper divisors (3782358).

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

2271690 is a wasteful number, since it uses less digits than its factorization.

2271690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643 (or 640 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 2271690 is about 1507.2126591825. The cubic root of 2271690 is about 131.4567896697.

The spelling of 2271690 in words is "two million, two hundred seventy-one thousand, six hundred ninety".