2291628 has 54 divisors (see below), whose sum is σ = 5899404. Its totient is φ = 692208.

The previous prime is 2291623. The next prime is 2291629. The reversal of 2291628 is 8261922.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 2291595 and 2291604.

It is not an unprimeable number, because it can be changed into a prime (2291623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 99625 + ... + 99647.

2^2291628 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2291628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2949702).

2291628 is an abundant number, since it is smaller than the sum of its proper divisors (3607776).

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

2291628 is a wasteful number, since it uses less digits than its factorization.

2291628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91 (or 47 counting only the distinct ones).

The product of its digits is 3456, while the sum is 30.

The square root of 2291628 is about 1513.8124058152. The cubic root of 2291628 is about 131.8402567145.

The spelling of 2291628 in words is "two million, two hundred ninety-one thousand, six hundred twenty-eight".