1215244764 has 72 divisors (see below), whose sum is σ = 3182187008. Its totient is φ = 390627360.

The previous prime is 1215244763. The next prime is 1215244781. The reversal of 1215244764 is 4674425121.

1215244764 is a `hidden beast` number, since 1 + 2 + 152 + 447 + 64 = 666.

1215244764 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215244763) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 340839 + ... + 344385.

Almost surely, 2^1215244764 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 1215244764, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1591093504).

1215244764 is an abundant number, since it is smaller than the sum of its proper divisors (1966942244).

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

1215244764 is a wasteful number, since it uses less digits than its factorization.

1215244764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3895 (or 3890 counting only the distinct ones).

The product of its digits is 53760, while the sum is 36.

The square root of 1215244764 is about 34860.3609275636. The cubic root of 1215244764 is about 1067.1396408102.

Adding to 1215244764 its reverse (4674425121), we get a palindrome (5889669885).

The spelling of 1215244764 in words is "one billion, two hundred fifteen million, two hundred forty-four thousand, seven hundred sixty-four".