2805728 has 12 divisors (see below), whose sum is σ = 5523840. Its totient is φ = 1402848.

The previous prime is 2805713. The next prime is 2805757. The reversal of 2805728 is 8275082.

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 87679 = 2805728 / (2 + 8 + 0 + 5 + 7 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 2805694 and 2805703.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43808 + ... + 43871.

It is an arithmetic number, because the mean of its divisors is an integer number (460320).

2^2805728 is an apocalyptic number.

It is an amenable number.

2805728 is a deficient number, since it is larger than the sum of its proper divisors (2718112).

2805728 is an equidigital number, since it uses as much as digits as its factorization.

2805728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87689 (or 87681 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 32.

The square root of 2805728 is about 1675.0307459865. The cubic root of 2805728 is about 141.0420209079.

The spelling of 2805728 in words is "two million, eight hundred five thousand, seven hundred twenty-eight".