1218306028 has 12 divisors (see below), whose sum is σ = 2137754080. Its totient is φ = 607519152.

The previous prime is 1218306007. The next prime is 1218306029. The reversal of 1218306028 is 8206038121.

It is a super-2 number, since 2×1218306028² = 2968539155722273568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1218306029) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 406788 + ... + 409771.

Almost surely, 2^1218306028 is an apocalyptic number.

It is an amenable number.

1218306028 is a deficient number, since it is larger than the sum of its proper divisors (919448052).

1218306028 is a wasteful number, since it uses less digits than its factorization.

1218306028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 816936 (or 816934 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 1218306028 is about 34904.2408311655. The cubic root of 1218306028 is about 1068.0349493162.

The spelling of 1218306028 in words is "one billion, two hundred eighteen million, three hundred six thousand, twenty-eight".