1215820268 has 24 divisors (see below), whose sum is σ = 2304172080. Its totient is φ = 558008640.

The previous prime is 1215820237. The next prime is 1215820289. The reversal of 1215820268 is 8620285121.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56003 + ... + 74618.

It is an arithmetic number, because the mean of its divisors is an integer number (96007170).

Almost surely, 2^1215820268 is an apocalyptic number.

It is an amenable number.

1215820268 is a deficient number, since it is larger than the sum of its proper divisors (1088351812).

1215820268 is a wasteful number, since it uses less digits than its factorization.

1215820268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130817 (or 130815 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 35.

The square root of 1215820268 is about 34868.6143687988. The cubic root of 1215820268 is about 1067.3080694892.

The spelling of 1215820268 in words is "one billion, two hundred fifteen million, eight hundred twenty thousand, two hundred sixty-eight".