2803780 has 36 divisors (see below), whose sum is σ = 6851628. Its totient is φ = 960960.

The previous prime is 2803777. The next prime is 2803781. The reversal of 2803780 is 873082.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1285956 + 1517824 = 1134^2 + 1232^2 .

It is a super-2 number, since 2×2803780² = 15722364576800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a zygodrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (2803781) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 451 + ... + 2410.

It is an arithmetic number, because the mean of its divisors is an integer number (190323).

2^2803780 is an apocalyptic number.

2803780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2803780 is an abundant number, since it is smaller than the sum of its proper divisors (4047848).

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

2803780 is a wasteful number, since it uses less digits than its factorization.

2803780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2884 (or 2875 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 2803780 is about 1674.4491631578. The cubic root of 2803780 is about 141.0093718097.

The spelling of 2803780 in words is "two million, eight hundred three thousand, seven hundred eighty".