216540806 has 8 divisors (see below), whose sum is σ = 326991600. Its totient is φ = 107543608.

The previous prime is 216540769. The next prime is 216540809. The reversal of 216540806 is 608045612.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216540809) 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, 363026 + ... + 363621.

It is an arithmetic number, because the mean of its divisors is an integer number (40873950).

Almost surely, 2^216540806 is an apocalyptic number.

216540806 is a deficient number, since it is larger than the sum of its proper divisors (110450794).

216540806 is a wasteful number, since it uses less digits than its factorization.

216540806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726798.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 216540806 is about 14715.3255485565. The cubic root of 216540806 is about 600.5003289652.

The spelling of 216540806 in words is "two hundred sixteen million, five hundred forty thousand, eight hundred six".