2118978028 has 6 divisors (see below), whose sum is σ = 3708211556. Its totient is φ = 1059489012.

The previous prime is 2118978023. The next prime is 2118978047. The reversal of 2118978028 is 8208798112.

It is not an unprimeable number, because it can be changed into a prime (2118978023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 264872250 + ... + 264872257.

Almost surely, 2^2118978028 is an apocalyptic number.

It is an amenable number.

2118978028 is a deficient number, since it is larger than the sum of its proper divisors (1589233528).

2118978028 is a wasteful number, since it uses less digits than its factorization.

2118978028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529744511 (or 529744509 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 46.

The square root of 2118978028 is about 46032.3584883503. The cubic root of 2118978028 is about 1284.4252003853.

The spelling of 2118978028 in words is "two billion, one hundred eighteen million, nine hundred seventy-eight thousand, twenty-eight".