2816820 has 36 divisors (see below), whose sum is σ = 8544900. Its totient is φ = 751104.

The previous prime is 2816819. The next prime is 2816831. The reversal of 2816820 is 286182.

It can be written as a sum of positive squares in 2 ways, for example, as 725904 + 2090916 = 852^2 + 1446^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 7645 + ... + 8004.

2^2816820 is an apocalyptic number.

2816820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2816820 is an abundant number, since it is smaller than the sum of its proper divisors (5728080).

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

2816820 is a wasteful number, since it uses less digits than its factorization.

2816820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15664 (or 15659 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 2816820 is about 1678.3384640769. The cubic root of 2816820 is about 141.2276389277.

The spelling of 2816820 in words is "two million, eight hundred sixteen thousand, eight hundred twenty".