2800530 has 72 divisors (see below), whose sum is σ = 7744932. Its totient is φ = 701568.

The previous prime is 2800519. The next prime is 2800531. The reversal of 2800530 is 350082.

It can be written as a sum of positive squares in 6 ways, for example, as 1896129 + 904401 = 1377^2 + 951^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2800531) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 75672 + ... + 75708.

2^2800530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2800530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3872466).

2800530 is an abundant number, since it is smaller than the sum of its proper divisors (4944402).

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

2800530 is a wasteful number, since it uses less digits than its factorization.

2800530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108 (or 76 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 2800530 is about 1673.4784133654. The cubic root of 2800530 is about 140.9548671001.

The spelling of 2800530 in words is "two million, eight hundred thousand, five hundred thirty".