215204535972 has 144 divisors (see below), whose sum is σ = 575739964800. Its totient is φ = 67676367360.

The previous prime is 215204535941. The next prime is 215204535977. The reversal of 215204535972 is 279535402512.

215204535972 is a `hidden beast` number, since 2 + 1 + 5 + 2 + 0 + 4 + 53 + 597 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (215204535977) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 10276072 + ... + 10296992.

It is an arithmetic number, because the mean of its divisors is an integer number (3998194200).

Almost surely, 2^215204535972 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 215204535972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (287869982400).

215204535972 is an abundant number, since it is smaller than the sum of its proper divisors (360535428828).

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

215204535972 is a wasteful number, since it uses less digits than its factorization.

215204535972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21186 (or 21181 counting only the distinct ones).

The product of its (nonzero) digits is 756000, while the sum is 45.

The spelling of 215204535972 in words is "two hundred fifteen billion, two hundred four million, five hundred thirty-five thousand, nine hundred seventy-two".