215641530 has 48 divisors (see below), whose sum is σ = 603799560. Its totient is φ = 53080704.

The previous prime is 215641529. The next prime is 215641561. The reversal of 215641530 is 35146512.

215641530 is a `hidden beast` number, since 2 + 15 + 641 + 5 + 3 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 57108249 + 158533281 = 7557^2 + 12591^2 .

It is a junction number, because it is equal to n+sod(n) for n = 215641494 and 215641503.

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 23 ways as a sum of consecutive naturals, for example, 90985 + ... + 93324.

Almost surely, 2^215641530 is an apocalyptic number.

215641530 is an abundant number, since it is smaller than the sum of its proper divisors (388158030).

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

215641530 is a wasteful number, since it uses less digits than its factorization.

215641530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184335 (or 184332 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 215641530 is about 14684.7379956198. The cubic root of 215641530 is about 599.6678995494.

The spelling of 215641530 in words is "two hundred fifteen million, six hundred forty-one thousand, five hundred thirty".