2828821 has 4 divisors (see below), whose sum is σ = 2832192. Its totient is φ = 2825452.

The previous prime is 2828809. The next prime is 2828857. The reversal of 2828821 is 1288282.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1288282 = 2 ⋅644141.

It is a cyclic number.

It is not a de Polignac number, because 2828821 - 2¹¹ = 2826773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2828521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 690 + ... + 2476.

It is an arithmetic number, because the mean of its divisors is an integer number (708048).

2^2828821 is an apocalyptic number.

It is an amenable number.

2828821 is a deficient number, since it is larger than the sum of its proper divisors (3371).

2828821 is a wasteful number, since it uses less digits than its factorization.

2828821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3370.

The product of its digits is 4096, while the sum is 31.

The square root of 2828821 is about 1681.9099262446. The cubic root of 2828821 is about 141.4279205202.

The spelling of 2828821 in words is "two million, eight hundred twenty-eight thousand, eight hundred twenty-one".