215232453540 has 72 divisors (see below), whose sum is σ = 703092689208. Its totient is φ = 52980295680.

The previous prime is 215232453521. The next prime is 215232453551. The reversal of 215232453540 is 45354232512.

215232453540 is a `hidden beast` number, since 2 + 1 + 52 + 32 + 4 + 535 + 40 = 666.

215232453540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 6820117056 + 208412336484 = 82584^2 + 456522^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 215232453495 and 215232453504.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45987501 + ... + 45992180.

It is an arithmetic number, because the mean of its divisors is an integer number (9765176239).

Almost surely, 2^215232453540 is an apocalyptic number.

215232453540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215232453540 is an abundant number, since it is smaller than the sum of its proper divisors (487860235668).

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

215232453540 is a wasteful number, since it uses less digits than its factorization.

215232453540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91979709 (or 91979704 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 36.

The spelling of 215232453540 in words is "two hundred fifteen billion, two hundred thirty-two million, four hundred fifty-three thousand, five hundred forty".