1215868608 has 168 divisors, whose sum is σ = 3629558400. Its totient is φ = 388730880.

The previous prime is 1215868597. The next prime is 1215868649. The reversal of 1215868608 is 8068685121.

1215868608 is a `hidden beast` number, since 1 + 2 + 1 + 586 + 8 + 60 + 8 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2660316 + ... + 2660772.

Almost surely, 2^1215868608 is an apocalyptic number.

1215868608 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1215868608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1814779200).

1215868608 is an abundant number, since it is smaller than the sum of its proper divisors (2413689792).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1215868608 is a wasteful number, since it uses less digits than its factorization.

1215868608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655 (or 642 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 45.

The square root of 1215868608 is about 34869.3075354243. The cubic root of 1215868608 is about 1067.3222143947.

The spelling of 1215868608 in words is "one billion, two hundred fifteen million, eight hundred sixty-eight thousand, six hundred eight".