1215324560 has 80 divisors (see below), whose sum is σ = 3005164800. Its totient is φ = 455497728.

The previous prime is 1215324559. The next prime is 1215324563. The reversal of 1215324560 is 654235121.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×1215324560² = 2954027572278387200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1215324563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 323171 + ... + 326909.

It is an arithmetic number, because the mean of its divisors is an integer number (37564560).

Almost surely, 2^1215324560 is an apocalyptic number.

1215324560 is a gapful number since it is divisible by the number (10) 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 1215324560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1502582400).

1215324560 is an abundant number, since it is smaller than the sum of its proper divisors (1789840240).

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

1215324560 is a wasteful number, since it uses less digits than its factorization.

1215324560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4008 (or 4002 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 1215324560 is about 34861.5054178674. The cubic root of 1215324560 is about 1067.1629973152.

Adding to 1215324560 its reverse (654235121), we get a palindrome (1869559681).

The spelling of 1215324560 in words is "one billion, two hundred fifteen million, three hundred twenty-four thousand, five hundred sixty".