2800640 has 44 divisors (see below), whose sum is σ = 6730536. Its totient is φ = 1118208.

The previous prime is 2800639. The next prime is 2800643. The reversal of 2800640 is 460082.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2800643) 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, 4847 + ... + 5393.

2^2800640 is an apocalyptic number.

2800640 is a gapful number since it is divisible by the number (20) 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 2800640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3365268).

2800640 is an abundant number, since it is smaller than the sum of its proper divisors (3929896).

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

2800640 is an equidigital number, since it uses as much as digits as its factorization.

2800640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572 (or 554 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 2800640 is about 1673.5112787191. The cubic root of 2800640 is about 140.9567125641.

The spelling of 2800640 in words is "two million, eight hundred thousand, six hundred forty".