1215204564 has 96 divisors (see below), whose sum is σ = 3333851136. Its totient is φ = 337334400.

The previous prime is 1215204521. The next prime is 1215204569. The reversal of 1215204564 is 4654025121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215204569) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 475089 + ... + 477639.

It is an arithmetic number, because the mean of its divisors is an integer number (34727616).

Almost surely, 2^1215204564 is an apocalyptic number.

1215204564 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 1215204564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1666925568).

1215204564 is an abundant number, since it is smaller than the sum of its proper divisors (2118646572).

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

1215204564 is a wasteful number, since it uses less digits than its factorization.

1215204564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2725 (or 2723 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

The square root of 1215204564 is about 34859.7843366823. The cubic root of 1215204564 is about 1067.1278737742.

Adding to 1215204564 its reverse (4654025121), we get a palindrome (5869229685).

The spelling of 1215204564 in words is "one billion, two hundred fifteen million, two hundred four thousand, five hundred sixty-four".