215728011 has 24 divisors (see below), whose sum is σ = 332186400. Its totient is φ = 134436096.

The previous prime is 215728001. The next prime is 215728043. The reversal of 215728011 is 110827512.

215728011 is a `hidden beast` number, since 2 + 1 + 572 + 80 + 11 = 666.

It is not a de Polignac number, because 215728011 - 2¹⁴ = 215711627 is a prime.

It is a super-2 number, since 2×215728011² = 93077149460032242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (215728001) by changing a digit.

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, 18066 + ... + 27528.

It is an arithmetic number, because the mean of its divisors is an integer number (13841100).

Almost surely, 2^215728011 is an apocalyptic number.

215728011 is a deficient number, since it is larger than the sum of its proper divisors (116458389).

215728011 is a wasteful number, since it uses less digits than its factorization.

215728011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9635 (or 9632 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 27.

The square root of 215728011 is about 14687.6822882305. The cubic root of 215728011 is about 599.7480525523.

The spelling of 215728011 in words is "two hundred fifteen million, seven hundred twenty-eight thousand, eleven".