1215053664 has 96 divisors (see below), whose sum is σ = 3488728320. Its totient is φ = 367219200.

The previous prime is 1215053639. The next prime is 1215053669. The reversal of 1215053664 is 4663505121.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215053669) 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, 462274 + ... + 464894.

It is an arithmetic number, because the mean of its divisors is an integer number (36340920).

Almost surely, 2^1215053664 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 1215053664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1744364160).

1215053664 is an abundant number, since it is smaller than the sum of its proper divisors (2273674656).

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

1215053664 is a wasteful number, since it uses less digits than its factorization.

1215053664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3084 (or 3076 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 1215053664 is about 34857.6198843237. The cubic root of 1215053664 is about 1067.0837011669.

Adding to 1215053664 its reverse (4663505121), we get a palindrome (5878558785).

The spelling of 1215053664 in words is "one billion, two hundred fifteen million, fifty-three thousand, six hundred sixty-four".