2820556 has 12 divisors (see below), whose sum is σ = 4972968. Its totient is φ = 1399712.

The previous prime is 2820553. The next prime is 2820557. The reversal of 2820556 is 6550282.

It is a super-2 number, since 2×2820556² = 15911072298272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2820553) 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, 2026 + ... + 3121.

It is an arithmetic number, because the mean of its divisors is an integer number (414414).

2^2820556 is an apocalyptic number.

It is an amenable number.

2820556 is a deficient number, since it is larger than the sum of its proper divisors (2152412).

2820556 is a wasteful number, since it uses less digits than its factorization.

2820556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5288 (or 5286 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 2820556 is about 1679.4511008065. The cubic root of 2820556 is about 141.2900489460.

The spelling of 2820556 in words is "two million, eight hundred twenty thousand, five hundred fifty-six".