1215824864 has 12 divisors (see below), whose sum is σ = 2393655264. Its totient is φ = 607912416.

The previous prime is 1215824861. The next prime is 1215824881. The reversal of 1215824864 is 4684285121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215824861) by changing a digit.

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 as a sum of consecutive naturals, namely, 18997232 + ... + 18997295.

It is an arithmetic number, because the mean of its divisors is an integer number (199471272).

Almost surely, 2^1215824864 is an apocalyptic number.

It is an amenable number.

1215824864 is a deficient number, since it is larger than the sum of its proper divisors (1177830400).

1215824864 is an equidigital number, since it uses as much as digits as its factorization.

1215824864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37994537 (or 37994529 counting only the distinct ones).

The product of its digits is 122880, while the sum is 41.

The square root of 1215824864 is about 34868.6802732768. The cubic root of 1215824864 is about 1067.3094143540.

The spelling of 1215824864 in words is "one billion, two hundred fifteen million, eight hundred twenty-four thousand, eight hundred sixty-four".