2820636 has 144 divisors (see below), whose sum is σ = 9384480. Its totient is φ = 725760.

The previous prime is 2820619. The next prime is 2820641. The reversal of 2820636 is 6360282.

2820636 is a `hidden beast` number, since 2 + 8 + 20 + 636 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 68776 + ... + 68816.

It is an arithmetic number, because the mean of its divisors is an integer number (65170).

2^2820636 is an apocalyptic number.

2820636 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2820636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4692240).

2820636 is an abundant number, since it is smaller than the sum of its proper divisors (6563844).

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

2820636 is a wasteful number, since it uses less digits than its factorization.

2820636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81 (or 66 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 2820636 is about 1679.4749179431. The cubic root of 2820636 is about 141.2913847462.

The spelling of 2820636 in words is "two million, eight hundred twenty thousand, six hundred thirty-six".