216537542 has 64 divisors (see below), whose sum is σ = 380588544. Its totient is φ = 91653120.

The previous prime is 216537539. The next prime is 216537583. The reversal of 216537542 is 245735612.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1580498 + ... + 1580634.

It is an arithmetic number, because the mean of its divisors is an integer number (5946696).

Almost surely, 2^216537542 is an apocalyptic number.

216537542 is a deficient number, since it is larger than the sum of its proper divisors (164051002).

216537542 is a wasteful number, since it uses less digits than its factorization.

216537542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273.

The product of its digits is 50400, while the sum is 35.

The square root of 216537542 is about 14715.2146433547. The cubic root of 216537542 is about 600.4973117619.

The spelling of 216537542 in words is "two hundred sixteen million, five hundred thirty-seven thousand, five hundred forty-two".