1215332664 has 128 divisors (see below), whose sum is σ = 3749760000. Its totient is φ = 319647744.

The previous prime is 1215332653. The next prime is 1215332687. The reversal of 1215332664 is 4662335121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1307752 + ... + 1308680.

It is an arithmetic number, because the mean of its divisors is an integer number (29295000).

Almost surely, 2^1215332664 is an apocalyptic number.

1215332664 is a gapful number since it is divisible by the number (14) 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 1215332664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1874880000).

1215332664 is an abundant number, since it is smaller than the sum of its proper divisors (2534427336).

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

1215332664 is a wasteful number, since it uses less digits than its factorization.

1215332664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1557 (or 1553 counting only the distinct ones).

The product of its digits is 25920, while the sum is 33.

The square root of 1215332664 is about 34861.6216490283. The cubic root of 1215332664 is about 1067.1653693207.

Adding to 1215332664 its reverse (4662335121), we get a palindrome (5877667785).

The spelling of 1215332664 in words is "one billion, two hundred fifteen million, three hundred thirty-two thousand, six hundred sixty-four".