2891228 has 6 divisors (see below), whose sum is σ = 5059656. Its totient is φ = 1445612.

The previous prime is 2891219. The next prime is 2891233. The reversal of 2891228 is 8221982.

It is a junction number, because it is equal to n+sod(n) for n = 2891194 and 2891203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361400 + ... + 361407.

It is an arithmetic number, because the mean of its divisors is an integer number (843276).

2^2891228 is an apocalyptic number.

It is an amenable number.

2891228 is a deficient number, since it is larger than the sum of its proper divisors (2168428).

2891228 is a wasteful number, since it uses less digits than its factorization.

2891228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722811 (or 722809 counting only the distinct ones).

The product of its digits is 4608, while the sum is 32.

The square root of 2891228 is about 1700.3611381115. The cubic root of 2891228 is about 142.4603850073.

The spelling of 2891228 in words is "two million, eight hundred ninety-one thousand, two hundred twenty-eight".