215428563 has 24 divisors (see below), whose sum is σ = 356085600. Its totient is φ = 122943744.

The previous prime is 215428547. The next prime is 215428567. The reversal of 215428563 is 365824512.

215428563 is a `hidden beast` number, since 21 + 54 + 28 + 563 = 666.

It is not a de Polignac number, because 215428563 - 2⁴ = 215428547 is a prime.

It is not an unprimeable number, because it can be changed into a prime (215428567) 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 23 ways as a sum of consecutive naturals, for example, 61873 + ... + 65261.

It is an arithmetic number, because the mean of its divisors is an integer number (14836900).

Almost surely, 2^215428563 is an apocalyptic number.

215428563 is a deficient number, since it is larger than the sum of its proper divisors (140657037).

215428563 is a wasteful number, since it uses less digits than its factorization.

215428563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4411 (or 4408 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 215428563 is about 14677.4849003499. The cubic root of 215428563 is about 599.4704243870.

The spelling of 215428563 in words is "two hundred fifteen million, four hundred twenty-eight thousand, five hundred sixty-three".