2872820 has 18 divisors (see below), whose sum is σ = 6048882. Its totient is φ = 1146096.

The previous prime is 2872817. The next prime is 2872823. The reversal of 2872820 is 282782.

It is an interprime number because it is at equal distance from previous prime (2872817) and next prime (2872823).

It can be written as a sum of positive squares in only one way, i.e., 2298256 + 574564 = 1516^2 + 758^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2872823) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7391 + ... + 7769.

It is an arithmetic number, because the mean of its divisors is an integer number (336049).

2^2872820 is an apocalyptic number.

2872820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2872820 is an abundant number, since it is smaller than the sum of its proper divisors (3176062).

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

2872820 is an equidigital number, since it uses as much as digits as its factorization.

2872820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767 (or 386 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 2872820 is about 1694.9395269448. The cubic root of 2872820 is about 142.1574000207.

The spelling of 2872820 in words is "two million, eight hundred seventy-two thousand, eight hundred twenty".