2728778 has 8 divisors (see below), whose sum is σ = 4408068. Its totient is φ = 1259424.

The previous prime is 2728777. The next prime is 2728801. The reversal of 2728778 is 8778272.

It can be written as a sum of positive squares in 2 ways, for example, as 2411809 + 316969 = 1553^2 + 563^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (2728771) 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, 52451 + ... + 52502.

2^2728778 is an apocalyptic number.

2728778 is a deficient number, since it is larger than the sum of its proper divisors (1679290).

2728778 is a wasteful number, since it uses less digits than its factorization.

2728778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104968.

The product of its digits is 87808, while the sum is 41.

The square root of 2728778 is about 1651.9013287724. The cubic root of 2728778 is about 139.7406422712.

The spelling of 2728778 in words is "two million, seven hundred twenty-eight thousand, seven hundred seventy-eight".