1215602144 has 48 divisors (see below), whose sum is σ = 2498340096. Its totient is φ = 581644800.

The previous prime is 1215602111. The next prime is 1215602149. The reversal of 1215602144 is 4412065121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215602149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63809 + ... + 80639.

It is an arithmetic number, because the mean of its divisors is an integer number (52048752).

Almost surely, 2^1215602144 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 1215602144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1249170048).

1215602144 is an abundant number, since it is smaller than the sum of its proper divisors (1282737952).

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

1215602144 is a wasteful number, since it uses less digits than its factorization.

1215602144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16939 (or 16931 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 1215602144 is about 34865.4864299926. The cubic root of 1215602144 is about 1067.2442389393.

Adding to 1215602144 its reverse (4412065121), we get a palindrome (5627667265).

The spelling of 1215602144 in words is "one billion, two hundred fifteen million, six hundred two thousand, one hundred forty-four".