1218068690 has 8 divisors (see below), whose sum is σ = 2192523660. Its totient is φ = 487227472.

The previous prime is 1218068671. The next prime is 1218068723. The reversal of 1218068690 is 968608121.

It can be written as a sum of positive squares in 2 ways, for example, as 1207771009 + 10297681 = 34753^2 + 3209^2 .

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

It is a super-2 number, since 2×1218068690² = 2967382667116632200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60903425 + ... + 60903444.

Almost surely, 2^1218068690 is an apocalyptic number.

1218068690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1218068690 is a deficient number, since it is larger than the sum of its proper divisors (974454970).

1218068690 is a wasteful number, since it uses less digits than its factorization.

1218068690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121806876.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 1218068690 is about 34900.8408208169. The cubic root of 1218068690 is about 1067.9655902402.

The spelling of 1218068690 in words is "one billion, two hundred eighteen million, sixty-eight thousand, six hundred ninety".