215528930 has 8 divisors (see below), whose sum is σ = 387952092. Its totient is φ = 86211568.

The previous prime is 215528903. The next prime is 215528933. The reversal of 215528930 is 39825512.

It can be written as a sum of positive squares in 2 ways, for example, as 174530521 + 40998409 = 13211^2 + 6403^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (215528933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10776437 + ... + 10776456.

Almost surely, 2^215528930 is an apocalyptic number.

215528930 is a deficient number, since it is larger than the sum of its proper divisors (172423162).

215528930 is a wasteful number, since it uses less digits than its factorization.

215528930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21552900.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 215528930 is about 14680.9035825456. The cubic root of 215528930 is about 599.5635066069.

The spelling of 215528930 in words is "two hundred fifteen million, five hundred twenty-eight thousand, nine hundred thirty".