1215718064 has 80 divisors (see below), whose sum is σ = 2615308800. Its totient is φ = 542868480.

The previous prime is 1215718051. The next prime is 1215718099. The reversal of 1215718064 is 4608175121.

It is a super-2 number, since 2×1215718064² = 2955940822271816192, which contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 3607304 + ... + 3607640.

It is an arithmetic number, because the mean of its divisors is an integer number (32691360).

Almost surely, 2^1215718064 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1215718064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1307654400).

1215718064 is an abundant number, since it is smaller than the sum of its proper divisors (1399590736).

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

1215718064 is a wasteful number, since it uses less digits than its factorization.

1215718064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658 (or 652 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 35.

The square root of 1215718064 is about 34867.1487793310. The cubic root of 1215718064 is about 1067.2781620504.

The spelling of 1215718064 in words is "one billion, two hundred fifteen million, seven hundred eighteen thousand, sixty-four".