2028780218 has 4 divisors (see below), whose sum is σ = 3043170330. Its totient is φ = 1014390108.

The previous prime is 2028780209. The next prime is 2028780227. The reversal of 2028780218 is 8120878202.

2028780218 = 12997² + 12998² + ... + 13008².

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (2028780209) and next prime (2028780227).

It can be written as a sum of positive squares in only one way, i.e., 1391066209 + 637714009 = 37297^2 + 25253^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 507195053 + ... + 507195056.

Almost surely, 2^2028780218 is an apocalyptic number.

2028780218 is a deficient number, since it is larger than the sum of its proper divisors (1014390112).

2028780218 is a wasteful number, since it uses less digits than its factorization.

2028780218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1014390111.

The product of its (nonzero) digits is 28672, while the sum is 38.

The square root of 2028780218 is about 45041.9828382366. The cubic root of 2028780218 is about 1265.9357578084.

The spelling of 2028780218 in words is "two billion, twenty-eight million, seven hundred eighty thousand, two hundred eighteen".