1215772731472 has 60 divisors (see below), whose sum is σ = 2552200932540. Its totient is φ = 561030462720.

The previous prime is 1215772731461. The next prime is 1215772731533. The reversal of 1215772731472 is 2741372775121.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 6 ways, for example, as 403077693456 + 812695038016 = 634884^2 + 901496^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 206725972 + ... + 206731852.

It is an arithmetic number, because the mean of its divisors is an integer number (42536682209).

Almost surely, 2^{1215772731472} 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 1215772731472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1276100466270).

1215772731472 is an abundant number, since it is smaller than the sum of its proper divisors (1336428201068).

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

1215772731472 is an frugal number, since it uses more digits than its factorization.

1215772731472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11809 (or 5896 counting only the distinct ones).

The product of its digits is 1152480, while the sum is 49.

The spelling of 1215772731472 in words is "one trillion, two hundred fifteen billion, seven hundred seventy-two million, seven hundred thirty-one thousand, four hundred seventy-two".